Estimation
Addition
Subtraction
Rules
Multiplication
100
Estimate the following problem: 28 + 15 =
50
100
8 + 7 =
15
100
16 - 9 =
7
100
Finish the pattern: 5 , 7 , 9 , _____ , _____ , _____
11 , 13, 15
100
2 * 9 =
18
200
Estimate the following problem: 47 - 11 =
40
200
48 + 40 =
88
200
80 - 20 =
60
200
What is the rule to the following pattern: 27, 24, 21, 18 , 15
-3
200
5 * 6
30
300
Estimate the following problem: 708 + 182 =
900
300
65 + 49 =
114
300
75 - 36 =
39
300
Finish the pattern: 2, 4, 8, _____ , _____
16, 32
300
3 * 4 =
12
400
Estimate the following problem: 357 - 250 =
100
400
309 + 273 =
582
400
453 - 238 =
215
400
What is the rule of the following pattern: 50, 42, 34, 26
-8
400
8 * 8 =
64
500
Estimate the following problem: 864 + 523 =
1,400
500
483 +756 =
1,239
500
715 - 236 =
479
500
What is the rule of the following pattern? 15, 38, 61, 84, 107
+23
500
20 * 7 =
140
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