Home/Second Grade Math/Week 8: Two-digit addition/Lesson 4
K-5 friendly lesson
Try one idea, then jump into the activity.These lessons are designed to feel short, friendly, and easy to follow.

Regroup tens and ones

Regrouping means trading 10 ones for 1 ten, or 1 ten for 10 ones.

Lesson 4

Concept

Base-ten rule: 10 ones = 1 ten Examples: - 14 ones = 1 ten and 4 ones - 2 tens and 13 ones = 3 tens and 3 ones - 4 tens and 0 ones = 40 This helps in addition and subtraction with regrouping.

Try it

Regroup: 1. 16 ones = __ ten(s) and __ one(s) 2. 2 tens and 15 ones = __ tens and __ ones 3. 1 ten and 12 ones = __ tens and __ ones 4. 37 = __ tens and __ ones