Adding 1-digit Numbers
Relating Subtraction to Addition
Adding and Subtracting Tens
Adding 2-digit Numbers
Subtracting 2-digit Numbers
100
5
Use the doubles + 1 strategy. 2 + 3 =
100
3 + 6 = 9 6 + 3 = 9
Complete the fact family. 3 + 6 = ______ 6 + _____ = 9
100
2 tens + 3 tens
20 + 30 is the same as ______ tens + ______ tens.
100
23
10 + 13 = _______
100
8
30 - 22 = _____
200
11
Use the doubles + 1 strategy. 5 + 6 =
200
7 - 3 = 4 4 + 3 = 7
Complete the fact family. 7 - 3 = ______ _____ + 3 = 7
200
4 tens - 3 tens.
40 - 30 is the same as _____ tens - ______ tens.
200
34
21 + 13 = ________
200
2
12 - 10 = ______
300
15
Use mental math. 8 + 7
300
11 - 4 = 7
Use each addition fact to subtract. 4 + 7 = 11, so 11 - 4 = ________.
300
11 tens - 3 tens = 8 tens
110 - 30 = 80 is the same as _____ tens - _____tens = _______ tens
300
72
30 + 42 = ________
300
14
45 - 31 = _______
400
13
Use mental math. 7 + 6 =
400
16 - 9 = 7
Use addition facts to subtract. 7 + 9 = 16, So 16 - 9 = ________.
400
90 + 60 = 150.
9 tens + 6 tens = 15 tens is the same as _____ + ______ = ______
400
102
83 + 19 = ________
400
32
81 - 49 = _______
500
My strategy for 9 + 8 was doubles + 1.
Describe your strategy for, 9 + 8.
500
2 + 6 = 8 8 - 2 = 6 or/ 8 - 6 = 2
Complete each addition sentence. Then use the same numbers to complete a related subtraction sentence. 2 + _______ = 8 _______ - _______ = ________
500
110 - 50 = 60.
Alex subtracted 5 tens blocks from 11 tens blocks. How many tens blocks are left?
500
59
45 + 14 = _______
500
49
77 - 28 = _______
M
e
n
u