Use Mental Math to Add
38+10
48
8 divided by 8
1
Name the 4 facts for 5 and 2
5x2
2x5
10/5
10/2
Estimate. Then find the actual sum.
240+345
Estimation: 240+350=590
Actual sum: 240+345=585
She has 4 puppies. She gave 2 puppies away. How many puppies does she have now?
2 puppies
45+57
102
7 divided by 7
1
Name the 4 facts for 3 and 4
3x4
4x3
12/3
12/4
Estimate. Then find the actual sum.
23+456
Estimation: 20+460=480
Actual sum: 23+456=479
The blue and red team score 50 point in total. The red team score 30 points. How many points did the blue team score?
20 points
32+43
75
8 divided by 1
8
Name the facts for 4 and 4
4x4
16/4
Estimate. Then add the actual sum.
67+73
Estimation: 70+70=140
Actual Sum: 67+73=140
The small and big dogs are 10 feet tall in total. The big dog is 7 feet. How tall is the small dog?
3 feet
43+13
56
9 divided by 1
9
Name the facts for 6 and 12
6x12
12x6
72/6
72/12
Estimate. Then check the actual sum.
64+54
Estimation: 60+50=110
Actual Sum: 118
The man bought 15 oranges at the supermarket. He gave 9 oranges away. How many oranges does the man have left?
6 oranges
24+34
58
10 divided by 1
10 divided by 10
10 and 1
Name the facts for 5 and 12
5x12
12x5
60/5
60/12
Estimate. Then add the actual sum.
578+123
Estimation: 580+120=700
Actual Sum: 701
There are 43 students in a classroom. There are 26 girls in the class. How many boys are in the class?
17 boys