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Lesson: Subtracting from 11 and 12 Mathematics

In this lesson, we will learn how to use pictures and subtraction equations to show all the ways to take away from the numbers 11 and 12.

Lesson Plan

Students will be able to

write subtraction equations to decompose the number 11,
write subtraction equations to decompose the number 12,
identify a missing subtrahend in an equation,
investigate systematic ways to find all the equations to subtract from 11 and 12.

Q1:

Look at the part–whole model. Write a subtraction sentence to show how you can find the missing number.

Q2:

Emma has shown two ways to subtract from 12.

Find other ways to take away from 12.

What is the missing number?

Write the equation.

Q3:

Look at the part-whole model. Write a subtraction sentence to show how you can find the missing number.