Practice Activity 2.1 Subtraction Concepts

• 15

• 5

• 2

We subtract to...

• brush our hair

• compare

• separate

• separate and compare

In subtraction, we subtract the part we know from the whole to find...

• the part we don't know

• the rotten banana

• the sum

• Mr. Piasecki

The answer to a subtraction sentence is called the ...

• sum

• whole

• pizza

• difference

What number sentence does not go with the model?

• 4 + 5 = 9

• 9 - 4 = 5

• 5 + 4 = 9

• 9 + 5 = 14

What is the operation and why?

9 cats sit on a fence. 3 cats leave. How many cats are left?

• Addition because I need to join

• Subtraction because I need to compare

• Subtraction because I need to separate

There are 10 students in the class. 3 have an early dismissal. How many students are left?

• 10 - 3 = 7
• 3 - 10 = 0
• 10 + 3 = 13
• 10 - 3 = 3

Find the missing part.

• 4
• 3
• 10
• 1

Choose the word that matches the picture.

• add

• subtract

• count on

• count back

• 1

• 2

• 3