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Mental Math 1

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Mental Math 1

Quiz

Squares and Multiplication

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About Quiz
8 times made

Created by

Georgios Michalopoulos
Georgios Michalopoulos
Greece

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Mental Math 1Online version

Squares and Multiplication

by Georgios Michalopoulos
1

35 * 35

Written answer

2

65 * 65

Written answer

3

95 * 95

Written answer

4

84 * 86

Written answer

5

81 * 89

Written answer

6

53 * 57

Written answer

7

13 * 14

Written answer

8

17 * 15

Written answer

9

15 * 14

Written answer

10

18 * 13

Written answer

11

12 * 16

Written answer

12

19 * 19

Written answer

Feedback

Squares of numbers that end in 5 always end in 25. 3 * (3 + 1) = 12

Squares of numbers that end in 5 always end in 25. 6 * (6 + 1) = 42

Squares of numbers that end in 5 always end in 25. 3 * (9 + 1) = 90

8 * (8 +1) = 72 4 * 6 = 24

8 * 9 = 72 1 * 9 = 09

(13 + 4) * 10 = 170 3 * 4 = 12 170 + 12 = 182

(17 + 5) * 10 = 220 5 * 7 = 35 220 + 35 = 255

(15 + 4) * 10 = 190 5 * 4 = 20 190 + 20 = 210

(18 + 3) * 10 = 210 8 * 3 = 24 210 + 24 = 234

(12 + 6) * 10 = 180 2 * 6 = 12 180 + 12 = 192

(19 + 9) * 10 = 280 9 * 9 = 81 280 + 81 = 361

 
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