Mental Math
33 + 66 =
99
48 + 27 =
75
135 + 231 =
What is the related subtraction fact
33 + 31 = 64
64 - 31 = 33 or
64 - 33 = 31
5
28 + 61 =
89
57 + 47 =
104
448 + 211 =
659
What is the related subtraction fact?
400 + 412 = 812
812 - 412 = 400 or
812 - 400 = 412
17 + ___ = 24
7
123 + 321 =
444
86 + 86 =
172
304 + 315 =
619
What is the related addition fact?
98 - 32 = 66
66 + 32 = 98 or
32 + 66 = 98
30 + ___ = 99
66
652 + 246 =
55 + 55 =
110
448 + 611 =
1,059
What is the related addition fact?
130 - 55 = 75
75 + 55 = 130 or
55 + 75 = 130
45 + ___ = 100
I have 35 dollars. I need 50 dollars. How many more dollars do I need?
$15
99 + 99 =
198
753 + 753 =
1,506
Finish the fact family for 50 + 70 = 120
70 + 50 = 120
120 - 70 = 50
120 - 50 = 70
650 + ___ = 800
150