Register Rescue Worksheet
Register Rescue • Level 1 Intervention
Register Rescue
Math & Financial Literacy
Scaffolded Decimal Addition
Name:
Date:
The Golden Rule of Decimal Addition
Always line up the decimal points vertically! When they are aligned, your place values (Ones, Tenths, Hundredths) will line up perfectly.
Part 1
Guided Alignment: Help the Cashier Fix the Receipt
Trace the decimal points inside the shaded column, fill in the numbers, and calculate the sum. The first one is started for you!
Apples & Bread $3.45 + $2.14
Milk & Cereal $4.82 + $1.73
Part 2
Total Independence: Draw & Line Up
For these problems, write the numbers inside the grids yourself. Make sure you put the decimal points in the shaded middle column first!
Soap & Towel $5.39 + $4.28
Juice & Cookies $6.74 + $2.45
Self Check:
Decimals aligned? Retraced the dot?
Page 1 of 2
Register Rescue • Real World Budgets
The Receipt Builder
Lined Paper Guidance
Scaffolded Column Alignment
The Ledger Line Method
Use the light blue vertical column lines on your scratchpad to keep each digit inside its own column. Remember to give the decimal point its very own vertical line!
Task 1
Scenario: Rebuild the Torn Receipt (4 Items)
The supermarket cash register printed a receipt, but it got torn! Look at the prices of the four items below, write them into your vertical aligned ledger lines, and calculate the Grand Total.
🍎
Apples
$3.15
🥛
Milk
$2.48
🥨
Pretzels
$1.95
🍌
Bananas
$1.20
Setup Directions:
- Write $3.15 in the top line.
- Write $2.48, $1.95, and $1.20 below.
- Ensure all 4 decimal points are stacked in the same column!
$ Ones . 10 100
$ .
$ .
$ .
$ .
Task 2
Scenario: The $10 Limit (3 Items)
Elena has a $10 bill. She wants to buy a notebook for $4.37, sparkly gel pens for $3.85, and a cute eraser for $0.95. Does she have enough money? Line up the numbers and add.
$ Ones . 10 100
$ .
$ .
$ .
Complete the Decision:
1. What is the grand total for all three items?
Total Cost: $
2. Does Elena have enough money? (Check one)
Yes, she does! No, she doesn't.
Register Rescue • Decimal Intervention Page 2 of 2
Register Rescue Teacher Guide
Register Rescue • Teacher Intervention Guide
Instructional Playbook
Level 1 Math Intervention
Decimal Addition & Alignment
Target Diagnostic Profile
For students who perform whole-number addition accurately but struggle with decimal alignment (e.g., adding $3.45 + $2.1 as $5.59 or $3.66). Ideal for Tier 2 small group intervention.
Interactive Mini-Lesson Script (5-7 Minutes)
Say: "Imagine we are running a cash register. A customer hands us a receipt for an apple that costs $1.45 and milk for $3.50. If we just write the numbers without aligning the decimal points, we might line them up on the right side like this: 145 + 35.0. That would make the total over thirty dollars! Does that make sense? Why not?"
Say: "Right, an apple and milk shouldn't cost that much! The secret to fixing this is our golden rule: Line up the decimal points! Think of the decimal point as a giant anchor that locks the ones, tenths, and hundredths in place."
Guided Work: "Look at Page 1 of your worksheet. Let's trace the decimal points inside the shaded columns first. That shaded column acts as our decimal track. Now let's carefully drop each number onto its track before we add."
Common Misconceptions & Probing Questions
| The Student Error | Why It Happens | Probing Question to Ask |
|---|
| Right-aligning numbers of different lengths (e.g., $4.2 + $1.35 written as $5.37) | Student is treating decimals like whole numbers and lining up the right margin automatically. | "Where is the decimal point in $4.2? Let's trace it down. Are the ones columns matching up?" |
| Dropping the decimal point in a random column in the answer row | Student solves the addition correctly but puts the point on the right/left randomly. | "Put your pencil on the top decimal point. Trace it straight down like an elevator. Where does it land?" |
| Adding columns without regrouping place values (e.g. 5 + 8 = 13, writes 13 in Tenths) | Student forgets that decimals regroup to the next place value on the left just like whole numbers. | "When we get 13 tenths, how many ones does that make? Where do we carry that extra 1?" |
Register Rescue • Teacher Playbook Page 1 of 2
Register Rescue • Worksheet Solutions
Visual Answer Key
Perfect Alignment Solutions
For Teacher Grading & Self-Correction
Part 1: Guided Practice
<table class="border-collapse font-mono text-[11px] text-slate-700"><tbody><tr><td class="w-6 h-6 border border-slate-200 text-center">3</td><td class="w-3 h-6 text-center font-bold text-emerald-600 bg-emerald-50">.</td><td class="w-6 h-6 border border-slate-200 text-center">4</td><td class="w-6 h-6 border border-slate-200 text-center">5</td></tr><tr class="border-b-2 border-slate-900"><td class="w-6 h-6 border border-slate-200 text-center">+ 2</td><td class="w-3 h-6 text-center font-bold text-emerald-600 bg-emerald-50">.</td><td class="w-6 h-6 border border-slate-200 text-center">1</td><td class="w-6 h-6 border border-slate-200 text-center">4</td></tr><tr class="bg-emerald-50 font-bold text-emerald-900"><td class="w-6 h-6 border border-emerald-200 text-center">5</td><td class="w-3 h-6 text-center font-bold text-emerald-600 bg-emerald-100">.</td><td class="w-6 h-6 border border-emerald-200 text-center">5</td><td class="w-6 h-6 border border-emerald-200 text-center">9</td></tr></tbody></table>
<table class="border-collapse font-mono text-[11px] text-slate-700"><tbody><tr class="text-[9px] text-emerald-600"><td class="text-right pr-1" colspan="4">Carry: ¹</td></tr><tr><td class="w-6 h-6 border border-slate-200 text-center">4</td><td class="w-3 h-6 text-center font-bold text-emerald-600 bg-emerald-50">.</td><td class="w-6 h-6 border border-slate-200 text-center">8</td><td class="w-6 h-6 border border-slate-200 text-center">2</td></tr><tr class="border-b-2 border-slate-900"><td class="w-6 h-6 border border-slate-200 text-center">+ 1</td><td class="w-3 h-6 text-center font-bold text-emerald-600 bg-emerald-50">.</td><td class="w-6 h-6 border border-slate-200 text-center">7</td><td class="w-6 h-6 border border-slate-200 text-center">3</td></tr><tr class="bg-emerald-50 font-bold text-emerald-900"><td class="w-6 h-6 border border-emerald-200 text-center">6</td><td class="w-3 h-6 text-center font-bold text-emerald-600 bg-emerald-100">.</td><td class="w-6 h-6 border border-emerald-200 text-center">5</td><td class="w-6 h-6 border border-emerald-200 text-center font-bold text-emerald-900">5</td></tr></tbody></table>
<table class="border-collapse font-mono text-[11px] text-slate-700"><tbody><tr class="text-[9px] text-emerald-600"><td class="text-right pr-1" colspan="4">Carry: ¹</td></tr><tr><td class="w-6 h-6 border border-slate-200 text-center">5</td><td class="w-3 h-6 text-center font-bold text-emerald-600 bg-emerald-50">.</td><td class="w-6 h-6 border border-slate-200 text-center">3</td><td class="w-6 h-6 border border-slate-200 text-center">9</td></tr><tr class="border-b-2 border-slate-900"><td class="w-6 h-6 border border-slate-200 text-center">+ 4</td><td class="w-3 h-6 text-center font-bold text-emerald-600 bg-emerald-50">.</td><td class="w-6 h-6 border border-slate-200 text-center">2</td><td class="w-6 h-6 border border-slate-200 text-center">8</td></tr><tr class="bg-emerald-50 font-bold text-emerald-900"><td class="w-6 h-6 border border-emerald-200 text-center">9</td><td class="w-3 h-6 text-center font-bold text-emerald-600 bg-emerald-100">.</td><td class="w-6 h-6 border border-emerald-200 text-center">6</td><td class="w-6 h-6 border border-emerald-200 text-center font-bold text-emerald-900">7</td></tr></tbody></table>
<table class="border-collapse font-mono text-[11px] text-slate-700"><tbody><tr class="text-[9px] text-emerald-600"><td class="text-right pr-1" colspan="4">Carry: ¹</td></tr><tr><td class="w-6 h-6 border border-slate-200 text-center">6</td><td class="w-3 h-6 text-center font-bold text-emerald-600 bg-emerald-50">.</td><td class="w-6 h-6 border border-slate-200 text-center">7</td><td class="w-6 h-6 border border-slate-200 text-center">4</td></tr><tr class="border-b-2 border-slate-900"><td class="w-6 h-6 border border-slate-200 text-center">+ 2</td><td class="w-3 h-6 text-center font-bold text-emerald-600 bg-emerald-50">.</td><td class="w-6 h-6 border border-slate-200 text-center">4</td><td class="w-6 h-6 border border-slate-200 text-center">5</td></tr><tr class="bg-emerald-50 font-bold text-emerald-900"><td class="w-6 h-6 border border-emerald-200 text-center">9</td><td class="w-3 h-6 text-center font-bold text-emerald-600 bg-emerald-100">.</td><td class="w-6 h-6 border border-emerald-200 text-center">1</td><td class="w-6 h-6 border border-emerald-200 text-center font-bold text-emerald-900">9</td></tr></tbody></table>
<table class="border-collapse font-mono text-[11px] text-slate-700"><tbody><tr class="text-[8px] text-emerald-600"><td class="text-right pr-1" colspan="5">Carry: ¹ ¹</td></tr><tr><td class="w-5 text-center text-slate-400">$</td><td class="w-5 h-5 border border-slate-200 text-center">3</td><td class="w-3 text-center font-bold text-emerald-600">.</td><td class="w-5 h-5 border border-slate-200 text-center">1</td><td class="w-5 h-5 border border-slate-200 text-center">5</td></tr><tr><td class="w-5 text-center text-slate-400">$</td><td class="w-5 h-5 border border-slate-200 text-center">2</td><td class="w-3 text-center font-bold text-emerald-600">.</td><td class="w-5 h-5 border border-slate-200 text-center">4</td><td class="w-5 h-5 border border-slate-200 text-center">8</td></tr><tr><td class="w-5 text-center text-slate-400">$</td><td class="w-5 h-5 border border-slate-200 text-center">1</td><td class="w-3 text-center font-bold text-emerald-600">.</td><td class="w-5 h-5 border border-slate-200 text-center">9</td><td class="w-5 h-5 border border-slate-200 text-center">5</td></tr><tr class="border-b border-slate-900"><td class="w-5 text-center text-slate-900 font-bold">+</td><td class="w-5 h-5 border border-slate-200 text-center">1</td><td class="w-3 text-center font-bold text-emerald-600">.</td><td class="w-5 h-5 border border-slate-200 text-center">2</td><td class="w-5 h-5 border border-slate-200 text-center">0</td></tr><tr class="bg-emerald-100 font-bold text-emerald-900"><td class="w-5 text-center">$</td><td class="w-5 h-5 text-center">8</td><td class="w-3 text-center text-emerald-700">.</td><td class="w-5 h-5 text-center">7</td><td class="w-5 h-5 text-center">8</td></tr></tbody></table>
<table class="border-collapse font-mono text-[11px] text-slate-700"><tbody><tr class="text-[8px] text-emerald-600"><td class="text-right pr-1" colspan="5">Carry: ² ¹</td></tr><tr><td class="w-5 text-center text-slate-400">$</td><td class="w-5 h-5 border border-slate-200 text-center">4</td><td class="w-3 text-center font-bold text-emerald-600">.</td><td class="w-5 h-5 border border-slate-200 text-center">3</td><td class="w-5 h-5 border border-slate-200 text-center">7</td></tr><tr><td class="w-5 text-center text-slate-400">$</td><td class="w-5 h-5 border border-slate-200 text-center">3</td><td class="w-3 text-center font-bold text-emerald-600">.</td><td class="w-5 h-5 border border-slate-200 text-center">8</td><td class="w-5 h-5 border border-slate-200 text-center">5</td></tr><tr class="border-b border-slate-900"><td class="w-5 text-center text-slate-900 font-bold">+</td><td class="w-5 h-5 border border-slate-200 text-center">0</td><td class="w-3 text-center font-bold text-emerald-600">.</td><td class="w-5 h-5 border border-slate-200 text-center">9</td><td class="w-5 h-5 border border-slate-200 text-center">5</td></tr><tr class="bg-emerald-100 font-bold text-emerald-900"><td class="w-5 text-center">$</td><td class="w-5 h-5 text-center">9</td><td class="w-3 text-center text-emerald-700">.</td><td class="w-5 h-5 text-center">1</td><td class="w-5 h-5 text-center">7</td></tr></tbody></table>