Counting Back
Count back. Write the number that is 2 less
8-2=?
8-2=6
6+____=8
So...8-6=
6+2=8
so 8-6=2
What subtraction sentence does this board problem show?
15-5-3
15-5
15-5=
Luke has 8 books. He gives soe away.HE has 6 left. How many books does he give away?
8-6=2
He gives away 2 books
Count back. What is 1 less than 5?
5-1=
5-1=4
What subtraction sentence can I make from
5+4=9
9-4=5
OR
9-5=4
12-6
12-6=6
What is
16-6-3?
16-6+10
10-3=7
Mark has 7 crayons. Ge gives some away. He has 4 left. How many crayons did he give away?
7-4=3
He gave away 3 crayons
Count back. What is 3 less than 9?
9-3=
9-3=6
What subtraction sentence can I make from
2+3=5?
5-2=3
OR
5-3=2
5-4
5-4=1
12-2=
12-2=10
Sam has 9 bears. She gives some away. Now she has 5 bears. How many did she give away?
9-5=4
she gave away 4 bears.
Count back. What is 3 less than 12?
12-3=
12-3=9
What subtraction problem can I make from
7+5=12
12-7=5
OR
12-5=7
13-3
13-3=10
What is
14-4
14-4=10
Tom has 6 bannanas. He gives some away. He has 1 banana now. How many did he give away?
6-1=5
He gave 5 bananas away.
Count back. What is 3 less than 15?
15-3=
15-3=12
What subtraction problem can I make from
6+5=11
11-6=5
OR
11-5=6
14-5
14-5=9
What is
15-5-1?
15-5=10
10-1=9
Sally has 10 snowmen. She gives some away. She has 8 snowmen now. How many did she give away?
10-8=2
She gave away two snowmen.