Add to Subtract
True or False:
If 7 + 2 = 9, then 9 − 7 = 2.
True! :)
What number has 1 ten and 3 ones?
13
The numbers are 3, 5, and 8.
Write one addition fact.
5+3=8
or
3+5=8
If I know that 5 + 3 = 8, what is 8 − 3?
5
How many tens and ones are in 17?
1 ten and 7 ones
The numbers are 4, 6, and 10.
Write one subtraction fact.
10-6=4
or
10-4=6
Fill in the missing number:
6 + ___ = 10
What subtraction fact can you use to check your answer?
4
10-6=
Which number is greater:
14 or 19?
Explain how you know using tens and ones.
19
1 ten and 9 ones
Fact family: 7, 8, 15
Write all 4 facts.
8+7=15
7+8=15
15-8=7
15-7=8
Sam has 12 apples. He gives 5 apples to a friend.
What addition fact can help you solve 12 − 5?
5+__=12
5+7=12
I have 1 ten and 8 ones.
If I add 1 more one, what number do I have now?
1 ten and 9 ones
If 9 + 5 = 14,
What are the other 3 facts in the family?
5+9=14
14-5=9
14-9=5
I know that 9 + 8 = 17.
Without counting, how can I use that fact to solve:
17 − 9 = ?
17 − 8 = ?
17-9=8
17-8=9
Break apart 16 into tens and ones.
Then show it another way.
1 ten and 6 ones
10+6=
The fact family is:
__ + 6 = 13
What is the missing number?
Then write all 4 facts.
7+6=13
6+7=13
13-7=6
13-6=7