Base Ten Addition Worksheet
Math Lab
Regrouping with Base-10 Blocks
Two-Digit Addition • Sums Under 100 • Show Your Regrouping
Name:
Date:
Example How Regrouping Works: 27 + 16 = 43
Rod = 10 Unit = 1
27
16
Trade 10 Ones
for 1 Ten ➔
43 Total
Vertical Form
1
T O
2 7
+ 1 6
4 3
Problem 1 Regroup Ones to Tens
T O
3 8
Extra Work & Block Sketch | = 10 • ▪ = 1
8 + 5 = ___ ones Regroup: ___ ten, ___ ones
Problem 2 Regroup Ones to Tens
T O
4 8
Extra Work & Block Sketch | = 10 • ▪ = 1
8 + 6 = ___ ones Regroup: ___ ten, ___ ones
Problem 3 Regroup Ones to Tens
T O
2 9
Extra Work & Block Sketch | = 10 • ▪ = 1
9 + 5 = ___ ones Regroup: ___ ten, ___ ones
Problem 4 Regroup Ones to Tens
T O
5 7
Extra Work & Block Sketch | = 10 • ▪ = 1
7 + 8 = ___ ones Regroup: ___ ten, ___ ones
Page 1 of 2 Double-Digit Addition with Regrouping Base-10 Strategy
Independent Practice
Regrouping Mastery
Solve each addition problem. Sketch your blocks and record your work in the spaces below.
Name:
Score: / 4
3-Step Checklist: ① Add ones ➜ ② Regroup 10 ones for 1 ten ➜ ③ Add all tens (including the new ten!)
Draw: | for Tens, ▪ for Ones
Problem 5 Show Your Work
T O
3 4
Base-10 Workspace Sketch blocks here
4 + 9 = ___ ones Regroup: ___ ten, ___ ones
Problem 6 Show Your Work
T O
5 8
Base-10 Workspace Sketch blocks here
8 + 6 = ___ ones Regroup: ___ ten, ___ ones
Problem 7 Show Your Work
T O
4 5
Base-10 Workspace Sketch blocks here
5 + 7 = ___ ones Regroup: ___ ten, ___ ones
Problem 8 Show Your Work
T O
6 7
Base-10 Workspace Sketch blocks here
7 + 9 = ___ ones Regroup: ___ ten, ___ ones
Page 2 of 2 Double-Digit Addition with Regrouping Check: Every sum must be under 100!
