Mental Math
774 + 100
884
20-10
10
16+ ____ = 10+10
4
79+121
200
890-190
700
524 + 100
624
6 + 14
20
100 = 20 + ____
80
341+218
559
723-487
236
774 - 100
664
20-15
5
5-1 = 2+ __
2
500+500
1000
501-123
378
524 - 100
424
15 - 9
4
34-20=7+___
7
257+527
784
332-118
214
200 - 100
100
2 + ---- = 14
12
120-89=20+___
11
75+25+100+47
247
fewer means
subtract