Think Addition Subtraction Slides
1st Grade Math Superpower
Numbers to 10
Secret Math Trick
Think Addition
to Subtract!
Use what you already know about adding to solve tricky minus problems in a snap!
?
Turn every subtraction problem into a fun mystery puzzle!
1
Addition & Subtraction are Best Friends!
Part + Part = Whole
Number Bond
Whole 7
/ \
Part 4
Part 3
ADD Put the parts together:
4 + 3 = 7
SUBTRACT Take one part away:
7 − 4 = 3
They use the exact same numbers!
When you see a minus sign, look for the missing partner!
2
How to Solve: 8 − 5 = ?
3 Easy Steps
1
Flip to Addition
Ask yourself: what do I add to 5 to make 8?
5 + ? = 8
2
Count Up to 8
Start at 5 and count how many more you need:
Count on:
6 7 8
That is 3 hops!
3
You Got It!
Since 5 + 3 = 8, your subtraction answer is:
8 − 5 = 3
Knowing your addition facts makes subtraction super fast!
3
See It on a Ten-Frame: 9 − 6 = ?
Picture Clue
Total: 9 counters
6 Blue ? Yellow
1
2
3
4
5
6
7
8
9
empty
Think Addition:
6 + 3 = 9
6 blue dots plus 3 yellow dots fill 9 spaces!
So Subtraction is:
9 − 6 = 3
You start with 6 blue... add 3 yellow to get to 9!
4
Be a Math Detective!
Let's Try Together
Solve This Mystery
10 − 7 = ?
Detective Clue
Turn it into an addition mystery! What number goes in the blank?
7 + ___ = 10
Count On Clue
Start at 7 and count up to 10 on your fingers:
“8, 9, 10!” → 3 fingers!
Because 7 + 3 = 10, we know: 10 − 7 = 3
You used addition to crack the case!
5
Match the Mystery Clue!
Fast Practice
Which addition fact helps you solve each subtraction problem?
Problem A
6 − 4 = ?
Think:
4 + 2 = 6
So 6 − 4 = 2!
Problem B
8 − 6 = ?
Think:
6 + 2 = 8
So 8 − 6 = 2!
Problem C
7 − 2 = ?
Think:
2 + 5 = 7
So 7 − 2 = 5!
Look at the smaller number, then ask: how many more to reach the big number?
Your New Subtraction Superpower!
Remember This!
!
The Secret Question
Whenever you see a minus sign:
“What can I add to the small number to make the big number?”
✓
Quick Detective Check
-
Start at the part you know.
-
Count up to the whole.
-
Your count is the subtraction answer!
Great job, Math Detective! You are ready to subtract with addition!
