Vocabulary
Count Back
Related Facts
Use a Number Line
Challenge
100
To subtract using a number line, start at the greater number and __________________.
Count Back
100
Start at 8, count back 4.
8 - 4 = 4
8, 7, 6 , 5, 4
100
Are these related facts?
5 + 4 = 9
4 + 5 = 9
9 - 5 = 4
5 - 4 = 9
No
5 - 4 = 9 is not part of this family, even though it has the same 3 numbers this number sentence does not make sense.
100
Use the number line to solve 10 - 6 = ____
Check number line for correct jumps.
10 - 6 = 4
100
Make 10 to subtract.
15 - 8 = _____
__ __
15 - ____ = _____
10 - ____ = _____
15 - 8 = _____
5 3
15 - 5 = __10___
10 - 3 = ___7___ ------> 15 - 8 = __7__
200
Addition and subtraction sentences that use the same numbers are a _____________________.
Fact Family
200
Count back to solve.
12 - 3 = ____
12 - 3 = 9
12, 11, 10, 9
200
Write the subtraction related fact.
7 + 6 = 13
13 - 6 = 7
or
13 - 7 = 6
200
Use the number line to solve for 12 - 6 = ______
Check number line for correct jumps.
12 - 6 = 6
200
Make 10 to subtract.
17 - 8 = _____
__ __
17 - ____ = _____
10 - ____ = _____
17 - 8 = _____
7 1
17 - 7 = __10___
10 - 1 = ___9___ ------> 17 - 8 = __9__
300
You can use related facts to find a _________________.
Missing Addend
300
Count back to solve.
20 - 7 = _____
20 - 7 = __13__
20, 19, 18, 17, 16, 15, 14, 13
300
Which subtraction fact is not related to 7 + 9 = 16?
16 - 7 = 9
9 - 7 = 16
16 - 9 = 7
9 - 7 = 16
300
Use a number line to solve for 17 - 8 = ______.
Check number line for correct jumps.
17 - 8 = 9
300
Maddie is thinking of a number. When she adds 4 to the number, she gets 13. What is her number?
4 + _____ = 13
4 + __9__ = 13
13 - 4 = ___9__
400
What is this showing you?
Count Back
400
Julie starts counting backwards from 16. She says "16, 15, 14, 13." What number sentence is he trying to solve?
16 - 3 = 13
16 - 4 = 13
13 - 3 = 16
16 - 3 = 13
400
17 - 6 = 11
Write the other 3 number sentences for this fact family.
6 + 11 = 17
11 + 6 = 17
17 - 11 = 6
400
Maria has 19 lollipops. She gives 7 away to her friends. How many lollipops does Maria have now?
19 - 7 = 12
Check for all 4 steps.
400
Samuel had 15 cookies for his party. He ate 3 cookies. How many cookies did he not eat? Write an addition sentence and a subtraction sentence.
____ + _____ = _____
____ - _____ = ______
Check for steps.
3 + 12 = 15
15 - 3 = 12
500
4 + 3 = 7 7 - 4 = 3
3 + 4 = 7 7 - 3 = 4
What is this an example of?
Fact Family
500
Sam starts counting backwards from 14. He says "14, 13, 12, 11, 10." What number sentence is he trying to solve?
14 - 5 = 10
14 - 4 = 10
14 - 5 = 9
14 - 4 = 10
500
Write the 4 number sentences for this family.
6 + 8 = 14
8 + 6 = 14
14 - 6 = 8
14 - 8 = 6
500
Lucy has 16 books. She returns 9 books to the library. How many books does Lucy still have?
Check for all 4 steps.
16 - 9 = 7
500
Add or subtract. Draw lines to match the doubles facts.
5 + 5 = ______ 20 - 10 = ______
9 + 9 = ______ 10 - 5 = _______
10 + 10 = _______ 18 - 9 = _______
5 + 5 = __10__ --------> 10 - 5 = ___5___
9 + 9 = ______ --------> 18 - 9 = ___9___
10 + 10 = _______ -------> 20 - 10 = ___10__