Mental Math
Estimate
Easy Addition
Harder Addition
Complete the number sentence
100
9 + 5
14
100
9 + 21
10 + 20 = 30
100
47 + 88
135
100
26 + 83 + 92
201
100
3 + 8 = 5 + ?
6
200
12 + 14
26
200
28 + 32
30 + 30 = 60
200
139 + 837
976
200
58 + 39 + 127
224
200
? + 9 + 2 = 15 + 6
10
300
25 + 35
60
300
54 + 75
50 + 80 = 130
300
403 + 629
1,032
300
629 + 203 + 170
1,002
300
(5 + ? ) + 3 = 8 + 9
9
400
17 + 28
45
400
139 + 462
140 + 460 = 600 or 100 + 500 = 600
400
558 + 1,385
1,943
400
8,217 + 5,301 + 42
13,560
400
20 + 4 = 16 + ?
8
500
46 + 69
115
500
873 + 329
870 + 330 = 1,200 or 900 + 300 = 1,200
500
3,826 + 9,571
13,397
500
482 + 3,020 + 378 + 9,261
13,141
500
? + 7 + 9 = 2 + 10 + 6
2
M
e
n
u