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Subtracting 10's
Adding to 100.
Mental Subtraction
Mental Addition
Random
100
60, come up with 2 subtraction sentences that both equal 60. Example 80-20=60. Use friendly numbers only!!!
90-30=60 or 70-10=60.
100
67 + ____ = 100
67 + 33 = 100
100
What is 42 minus 21?
42-21=21
100
56+32=?
56+32=88
100
51 + 32 = ?
51 + 32 = 83
200
20, come up with 2 subtraction sentences that both equal 20. Example 30-10=20. Use friendly numbers only!!!
50-30=20 OR 80-60=20.
200
44 + ____ = 100
44 + 56 = 100
200
What is 78 minus 55?
78-55=23
200
32+66=?
32+66=98
200
55 + 35 = ?
55 + 35 = 90
300
10, come up with 2 subtraction sentences that both equal 10. Example 80-70=10. Use friendly numbers only!!!
90-80=10 OR 20-10=10.
300
____ + 21 = 100
79 + 21 = 100
300
What is 90 minus 33?
90-33=57
300
22+__=87
22+65=87
300
17 + 44 = ?
17 + 44 = 61
400
40, come up with 2 subtraction sentences that both equal 40. Example 90-50=40. Use friendly numbers only!!!
60-20=40 OR 70-30=40.
400
____ + 17 = 100
83 + 17 = 100
400
What is 76 minus 10?
76-10=66
400
48 + 39 = ?
48 + 39 = 87
400
18 + 26 = ?
18 + 26 = 44
500
30, come up with 2 subtraction sentences that both equal 30. Example 50-20=30. Use friendly numbers only!!!
40-10=30 OR 60-30=30.
500
88 + ___ = 100
88 + 12 = 100
500
What is 100 minus 64?
100-64=36
500
65 + 28 = ?
65 + 28 = 93
500
66 + 64 = ?
66 + 64 = 130