Add With In 20
9 + 7=
16
Decompose:
17 + 20 =
Solve:
10 + 20 + 7= 37
25 + 16 = 116
41
24 + 17 + 19 =
60
True or False. An addend is the answer to an addition problem.
False.
7 + 5 =
12
Decompose:
35 + 26 =
Solve:
30 + 20= 50
5 + 6= 11
50 + 11= 61
54 + 16= 60
70
29 + 23=
52
True or False. A sum is the answer to an addition problem.
True
8 + 7 =
15
Adjust the addends:
72 + 19
Solve:
71 + 20= 91
Ethan said 34 + 37 = 61, What is his error?
regroup the ones place
13 + 17 + 16 + 45=
91
True or False.-Partial product is when you break apart the place value to make addition easier.
True
9 + 8 =
17
Decompose the second addend to make doubles.
6 + 8 =
6 + 6 + 2= 14
Aidan said 74 + 37 = 11, What is his error?
Regroup in tens place.
Use a number line to help you.
34 + ? = 79
45
Create Your own 3 addend problem.
Answers Vary
3 + 4 + 11=
18
Decompose the second addend to make doubles.
7 + 9 =
7 + 7 + 2= 16
Alaina says 74 + + 15 + 37 = 216, What is her error?
She flipped the tens and hundreds digit.
126
Use a number line to help you.
25 + ? = 60
35
Add your height in inches with 2 other people you know in inches.
Answers will vary