Lesson 8 Review Slides
Whiteboard Review Game
15 Total Challenges
Decimal Dash
Word Form & Expanded Form (digit × place value)
Expanded Form Rule: (1 × 100) + (8 × 10) + (4 × 0.1)
Whiteboards & Dry-Erase Markers Ready 30 Seconds per Question
How to Play
Simple 3-Step Routine
1
Solve Silently
Write your answer large and clear on your whiteboard. Work on your own!
30 Seconds
2
Boards Up
When you hear "3-2-1 Boards Up!" hold your board high for the teacher to check.
No Erasing
3
Self-Score
Check the reveal slide. Earn 1 point per correct answer. Keep your running score!
15 Max Points
Round 1: Questions 1–5 (Word Form) • Round 2: Questions 6–10 (Expanded Form) • Round 3: Questions 11–15 (Advanced Expanded Form)
Question 1 of 15 Round 1 • Word Form
Write this decimal in Word Form:
0.8
Write on your whiteboard Ready for "Boards Up!"
Answer Reveal 1 1 Point
Standard Form: 0.8
eight tenths
The 8 is in the first place after the decimal point (tenths).
Give yourself 1 point if correct! Question 2 is up next
Question 2 of 15 Round 1 • Word Form
Write this decimal in Word Form:
0.35
Remember the hyphen! Ready for "Boards Up!"
Answer Reveal 2 1 Point
Standard Form: 0.35
thirty-five hundredths
Ends in the second place past the decimal: hundredths.
Did you include the hyphen in thirty-five? Question 3 is up next
Question 3 of 15 Round 1 • Word Form
Write this decimal in Word Form:
4.09
What word represents the decimal point? Ready for "Boards Up!"
Answer Reveal 3 1 Point
Standard Form: 4.09
four and nine hundredths
The word and is used only for the decimal point!
Did you write "hundredths" instead of tenths? Question 4 is up next
Question 4 of 15 Round 1 • Word Form
Write this decimal in Word Form:
0.612
Notice there are 3 decimal places Ready for "Boards Up!"
Answer Reveal 4 1 Point
Standard Form: 0.612
six hundred twelve thousandths
Three places past the decimal name the thousandths place.
Notice: No "and" before twelve! Question 5 is up next
Question 5 of 15 Round 1 • Word Form
Write this decimal in Word Form:
15.074
Say the whole number first, then the decimal part Ready for "Boards Up!"
Answer Reveal 5 1 Point
Standard Form: 15.074
fifteen and seventy-four thousandths
0 in tenths, 7 in hundredths, 4 in thousandths = seventy-four thousandths.
Tally your Round 1 score (max 5 points) Entering Round 2: Expanded Form!
Question 6 of 15 Round 2 • Number Given → Write Expanded Form
Given the number below, write its Expanded Form:
6.4
Use (digit × place value) + ... format
Write: (digit × 1) + (digit × 0.1) Ready for "Boards Up!"
Answer Reveal 6 1 Point
Given Number: 6.4
(6 × 1) + (4 × 0.1)
Fraction form also accepted: \( (6 \times 1) + (4 \times \frac{1}{10}) \)
Did you multiply each digit by its place value? Question 7 is up next
Question 7 of 15 Round 2 • Number Given → Write Expanded Form
Given the number below, write its Expanded Form:
28.5
Use (digit × place value) + ... format
Identify tens, ones, and tenths Ready for "Boards Up!"
Answer Reveal 7 1 Point
Given Number: 28.5
(2 × 10) + (8 × 1) + (5 × 0.1)
Fraction form also accepted: \( (2 \times 10) + (8 \times 1) + (5 \times \frac{1}{10}) \)
2 tens = (2 × 10) Question 8 is up next
Question 8 of 15 Round 2 • Number Given → Write Expanded Form
Given the number below, write its Expanded Form:
3.79
Use (digit × place value) + ... format
Ones, tenths, hundredths Ready for "Boards Up!"
Answer Reveal 8 1 Point
Given Number: 3.79
(3 × 1) + (7 × 0.1) + (9 × 0.01)
Fraction form also accepted: \( (3 \times 1) + (7 \times \frac{1}{10}) + (9 \times \frac{1}{100}) \)
Hundredths place is multiplied by 0.01 Question 9 is up next
Question 9 of 15 Round 2 • Number Given → Write Expanded Form
Given the number below, write its Expanded Form:
50.48
Watch the zero in the ones place!
Do you need a term for the 0 ones? Ready for "Boards Up!"
Answer Reveal 9 1 Point
Given Number: 50.48
(5 × 10) + (4 × 0.1) + (8 × 0.01)
Zeros have a value of 0, so (0 × 1) is omitted.
Award 1 point if correct! Question 10 is up next
Question 10 of 15 Round 2 • Number Given → Write Expanded Form
Given the number below, write its Expanded Form:
7.063
Look carefully at the place value of the 6 and 3!
6 is hundredths, 3 is thousandths Ready for "Boards Up!"
Answer Reveal 10 1 Point
Given Number: 7.063
(7 × 1) + (6 × 0.01) + (3 × 0.001)
Fraction form also accepted: \( (7 \times 1) + (6 \times \frac{1}{100}) + (3 \times \frac{1}{1000}) \)
Tally your Round 2 score! (Questions 6–10) Round 3: Bigger Numbers & Words to Expanded!
Question 11 of 15 Round 3 • Number Given → Write Expanded Form
Given this number, write it in Expanded Form:
41.05
Notice the zero placeholder in the tenths place!
Write: (digit × value) + ... Ready for "Boards Up!"
Answer Reveal 11 1 Point
Given Number: 41.05
(4 × 10) + (1 × 1) + (5 × 0.01)
Since tenths is 0, skip directly to hundredths: (5 × 0.01)!
Fraction form: (4 × 10) + (1 × 1) + (5 × 1/100) Question 12 is up next
Question 12 of 15 Round 3 • Number Given → Write Expanded Form
Given this number, write it in Expanded Form:
803.704
Careful! There are zeros in both the tens and hundredths places!
Write: (digit × value) + ... Ready for "Boards Up!"
Answer Reveal 12 1 Point
Given Number: 803.704
(8 × 100) + (3 × 1) + (7 × 0.1) + (4 × 0.001)
8 hundreds, 3 ones, 7 tenths, 4 thousandths. Only non-zero digits need terms!
Did you multiply 8 by 100 and 4 by 0.001? Question 13 is up next
Question 13 of 15 Round 3 • Number Given → Write Expanded Form
Given this number, write it in Expanded Form:
125.08
Hundreds, tens, ones, and decimal places!
Write: (digit × value) + ... Ready for "Boards Up!"
Answer Reveal 13 1 Point
Given Number: 125.08
(1 × 100) + (2 × 10) + (5 × 1) + (8 × 0.01)
Notice that 8 is in the hundredths place, so it is (8 × 0.01).
Award 1 point if correct! Question 14 is up next
Question 14 of 15 Round 3 • Word Form to Expanded Form
Read the number in words, then write its Expanded Form:
"five and twenty-six hundredths"
Use (digit × value) + ... format
Hint: Think of the digits (5.26), then expand Ready for "Boards Up!"
Answer Reveal 14 1 Point
"five and twenty-six hundredths" → Standard: 5.26
(5 × 1) + (2 × 0.1) + (6 × 0.01)
Fraction form also accepted: \( (5 \times 1) + (2 \times \frac{1}{10}) + (6 \times \frac{1}{100}) \)
Final Question 15 is coming up! Get ready for the finale!
Question 15 of 15 Grand Finale Challenge
Read the number in words, then write its Expanded Form:
"eighty and four hundred five thousandths"
Write standard digits first (80.405) to check the zeros!
Use (digit × value) + ... format Ready for Final "Boards Up!"
Final Answer Reveal 15 1 Point
Standard Form: 80.405
(8 × 10) + (4 × 0.1) + (5 × 0.001)
Fraction form also accepted: \( (8 \times 10) + (4 \times \frac{1}{10}) + (5 \times \frac{1}{1000}) \)
You completed all 15 questions! Check Final Scorecard →
Decimal Dash Results
Review Completed
13 – 15 Points
Decimal Master
Expert on word form, expanded multiplication, and zero placeholders!
9 – 12 Points
Place Value Star
Solid grasp of tenths, hundredths, and thousandths. Great work!
Up to 8 Points
Rising Mathematician
Keep practicing expanded forms and remembering: "and" = decimal point!
Expanded Form Rule: Multiply each digit by its place value unit: (d × 100) + (d × 10) + (d × 1) + (d × 0.1) + (d × 0.01) + (d × 0.001)
