Add within 20
What is 7 + 6 ?
7 + 6 = 13
7 + 6 =
7 + 3 + 3 =
10 + 3 = 13
What is 14 - 6?
14 - 6 = 8
There are 5 red apples and 9 green apples. How many apples are there altogether?
14 apples
5 + 9 = 14
What number comes right after 99?
100
True or false:
10 + 5 = 15
True
What is 9 + 8?
9 + 8 = 17
9 + 8 =
9 + 1 + 7 =
10 + 7 = 17
What is 17 - 9?
17 - 9 = 8
There are 18 students at the planetarium. 7 are first graders. How many are second graders?
11 second graders
7 + 11 = 18
How many tens and ones are in the number 83?
8 tens 3 ones
True or false:
13 – 6 = 8
False
13 - 6 = 7
What number makes this true?
8 + __ = 15?
8 + 7 = 15
What number makes this true? 20 - __ = 13
20 - 7 = 13
Diego and Tyler saw 15 shooting stars together. Diego saw 6. How many did Tyler see?
9 shooting stars
6 + 9 = 15
What is the value of the digit 1 in the number 104?
100 (1 hundred)
True or false:
9 + 4 = 4 + 9
True!
What is
6 + 7 + 4 ?
6 + 7 + 4 = 17
6 + 7 + 4 =
10 + 7 = 17
If you start at 18 and subtract 5, then subtract 4 more, what do you get?
18 - 5 - 4 = 9
Elena bought 12 star stickers and some planet stickers—20 stickers altogether. How many planet stickers did she buy? Write two equations that could solve this.
8 planet stickers
12 + 8 = 20
or
20 - 12 = 8
Put these numbers in order from least to greatest: 109, 91, 119, 100
91 , 100 , 109 , 119
True or false:
16 – 8 = 8 + 0
True. Both equal 8
Lin says 9 + 9 = 19. Is she right? Why or why not?
She is not right, because 9 + 9 = 18.
9 + 9 =
9 + 1 + 8 =
10 + 8 = 18
Jada had 20 stickers. She gave some away and has 7 left. How many did she give away? Write an equation.
20 - 7 = 13 or 7 + 13 = 20
Noah painted 9 white stars and some yellow stars. He painted 16 stars in all. Then he painted 3 more yellow stars. How many yellow stars does Noah have now?
10 yellow stars
First: 16 - 9 = 7 yellow stars
Next: 7 + 3 = 10 yellow stars
"I am thinking of a number. It has 11 tens and 3 ones. What number am I?"
113
True or false: There is only one way to break 15 into two parts.
False. You can break 15 into many pairs: 1+14, 2+13, 3+12...