Lesson: Making Two-Digit Numbers Mathematics • 1st Grade

In this lesson, we will learn how to decompose two-digit numbers into tens and ones in different ways, using patterns to find all the ways.

Lesson Plan

Students will be able to

use models to decompose two-digit numbers in multiple ways,
use a systematic method to find possible decompositions of two-digit numbers,
break up two-digit numbers into more than two parts (multiple groups of tens and a group of ones).

Q1:

Complete the following: ?

Q2:

Which place value table also shows 74?

Hint: Regroup tens into ones.

Q3:

Michael knows that 32 is 3 tens and 2 ones.

There are other ways to make 32.

Regroup 1 ten into 10 ones. Find the missing part.

32 is 2 tens and ones.

Regroup another ten into 10 ones. Find the missing part.

32 is 1 ten and ones.