Lesson Worksheet: Subtracting by Counting Back: Numbers up to 20 Mathematics • 1st Grade

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In this worksheet, we will practice subtracting within 20 by counting back from the starting number.

Q1:

On this domino, the dots on one side are covered with a sticker, and the total number of dots is written above it.

How many dots are under the sticker on this domino?

Q2:

Michael holds up 9 fingers and starts counting down as he puts down one finger at a time. He stops when he is holding up 4 fingers.

Decide whether he was adding or subtracting by picking the number sentence that describes what he did.

Q3:

Emma put her counter on 12 then moved it back 2 spaces.

Help her find the missing number:

Q4:

This is a subtraction machine.

It subtracts 3 from any number you put in.

What number will come out if you put 8 in?

What number will come out if you put 11 in?

What number will come out if you put 19 in?

Q5:

Hannah is playing a game using number cards. She steps on a number and jumps to land on another number. If Hannah steps on number 18 and jumps backward 4 jumps, which number will she land on?

Q6:

Olivia and Mason had 12 cookies. They ate some for breakfast. The picture shows the cookies left over. How many cookies did they eat?

Q7:

If there should be 12 counters in the given model, how many counters are missing?

Q8:

Complete the missing values in the figure from left to right.

A8, 7, 6
B10, 9, 8
C9, 8, 7

Q9:

To find 19 take away 6, we can start at 19 and count backward 6.

Finish counting backward to find the answer to 19 take away 6.

Q10:

Jacob has two cards. Each card has a number on it. If the sum of the numbers on the two cards is 13, what is the missing number on the other card?

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