Write a Related Subtraction Fact for 9+3=12
Fact families and basic addition and subtraction facts
This article explains how to use fact families to help children learn the basic addition and subtraction facts (with single-digit numbers), and also contains a complete example lesson with exercises and word problems about fact families where the sum is 13 or 14.
What is a fact family?
A fact family is a group of math facts using the same numbers. In the case of addition/subtraction, you use three numbers and get four facts. For example, you can form a fact family using the three numbers 10, 2, and 12: 10 + 2 = 12, 2 + 10 = 12, 12 − 10 = 2, and 12 − 2 = 10.
Where do we use fact families?
We can use fact families to reinforce or learn the connection between addition and subtraction, and to help children memorize the basic addition & subtraction facts. The two videos below explain several strategies for learning addition and subtraction facts, including number rainbows and fact families.
After the videos, there follows a complete lesson with many exercises and word problems about fact families with 13 and 14 (where the sum is 13 or 14), taken from my book Math Mammoth Add & Subtract 2-A.
A Lesson on Fact Families - sums with 13 and 14
1. Fill in. In each fact family, color the marbles so they match the numbers in it.
2. Connect with a line the problems that are from the same fact family. You don't need to
write the answers.
13 − 7 =  5 + 11 − 3 = 8 + 12 − 3 = 7 + | | 11 − 4 = 11 − 8 = 5 + 12 − 5 = 6 + 9 + | 12 − 7 = 13 − 6 = 3 + 13 − 5 = 3 + 4 + |
3. Fill in. In each fact family, color the marbles so they match the numbers in it.
4. Subtract.
| a. 13 − 8 = ____ 14 − 6 = ____ | b. 13 − 5 = ____ 13 − 4 = ____ | c . 12 − 7 = ____ 13 − 7 = ____ | d. 12 − 9 = ____ 14 − 9 = ____ |
5. Find the missing numbers.
6. Solve the word problems.
| a. Ted arranged his toy cars in rows. The first row had seven cars, the second had seven, and the third row had four. How many cars does Ted have? |
| b.If you have 14 strawberries and I have eight, how many more do you have? |
| c. Dad has six cherries and Mom has five more than him. How many cherries does Mom have? |
| d. At first Mom had 20 apples to make a pie, but she gave each of the four children one apple before she made the pie. How many apples did she have left for the pie? |
7. Figure out the patterns and continue them!
| a. | | | | | | | | | |||||||||
| 40 | 48 | 56 | 64 | 72 | _____ | _____ | _____ | _____ | |||||||||
| b. | | | | | | | | | |||||||||
| 17 | 21 | 25 | 29 | _____ | _____ | _____ | _____ | _____ | |||||||||
This lesson is taken from Maria Miller's book Math Mammoth Add & Subtract 2A, and posted at www.HomeschoolMath.net with permission from the author. Copyright © Maria Miller.
Write a Related Subtraction Fact for 9+3=12
Source: https://www.homeschoolmath.net/teaching/a/fact_families.php
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