Lesson Worksheet: Relating Addition to Subtraction: Numbers up to 20 Mathematics • 1st Grade
In this worksheet, we will practice writing a family of addition and subtraction facts linking three numbers up to 20.
We know that . Use the picture to check this if you need to.
Use this addition fact to find the missing number in the subtraction sentence .
This domino has 13 dots. How many dots are hidden?
We know that takeaway is .
Here are the four number sentences for 18, 7, and 11.
Now, think about the numbers 3, 4, and 7.
Which of the number sentences below does not belong?