Learning Coach — 9.2 Regroup Ones as Tens

Objectives

Students will:

Make tens from ones to add

Skills Needed

Students must be able to:

Regroup 1s to make 10s
Add two-digit numbers using groups of 10s and 1s

Materials Needed

Students will need:

base-ten blocks (rods and unit cubes)

Keywords

Regrouping

Learning Coach Notes

Ask your student to describe what regrouping is and how to regroup ones as tens.

Regroup Ones as Tens

Let’s do an activity with regrouping.

Learn!

Goal: Can you regroup to add?

It can be a little scary to count large groups of items, unless you learn strategies of grouping by 10s! Follow this activity to practice.

ALTTEXT: Enter key opens full-screen view with video.

How many groups of 10 do you see?

4 groups of 10 lollipops, and 1 group of 5, and another group of 2.

Count the groups of 10. What is the missing number? Type your answer in the blank.

10, 20, 30, ___

What is 40 + 7?

4 groups of 10 lollipops, and 7 groups of single lollipops. The number 40 is under the 4 groups of 10, and the numbers 41, 42, 43, 44, 45, 46, ___ are under the single groups.