Subtraction Facts Stratagies
Presentation
•
Mathematics
•
2nd Grade
•
Easy
Standards-aligned
Cindy Kinsey
Used 183+ times
FREE Resource
5 Slides • 12 Questions
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Subtraction Facts Strategies
Ways to attack subtraction facts!
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Counting Back
Counting back is helpful for when you are subtracting 1 or 2 from a number.
Example: 7 - 2
All you need to do is count back from 7 two numbers...so 7-6-5.
7-2 = 5
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Counting Up
When numbers are really close together you can count up to see the difference between the numbers. Let's look at the subtraction fact
12 - 9. These numbers are pretty close on a number line so I won't have to count too much if I start at 9 and count up to 12... 9, 10, 11, 12
I only counted up 3 numbers so the difference is 12 - 9 = 3
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Doubles
Most of us know our doubles facts...
2 + 2 =4, 3 + 3 = 6, 4 + 4 =8, 5 + 5 =10
6 + 6 =12 and so on! We can use this knowledge to help us when we have a doubles subtraction fact...
Example
10- 5 =(we can think 5 + 5 =10) so
10 - 5 = 5
Or 12 - 6 = 6 because 6 + 6 = 12
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Backwards Addition
Some addition math facts you just know! You can use that knowledge to solve subtraction facts. Subtraction is the opposite of addition. The have a special relationship. So if you know that 7 + 6 = 13 then you can use that to solve 13 -7 You can think 7 + ___ = 13 and you will have your answer of 8!
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Subtraction Facts Strategies
Ways to attack subtraction facts!
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