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Flashcards in Arithmetic Tricks Deck (55)
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1

Find the multiple of two numbers separated by 2 (e.g., 12 and 14)

square the number in the middle and subtract 1 (e.g., 13 x 13 = 169-1 = 168)

2

225

15 squared

3

121

11 squared

4

400

20 squared

5

625

25 squared

6

169

13 squared

7

900

30 squared

8

196

14 squared

9

125

5 cubed

10

8

2 cubed

11

216

6 cubed

12

27

3 cubed

13

1000

10 cubed

14

64

4 cubed

15

4ˆ4

256

16

3ˆ3

27

17

4ˆ3

64

18

5ˆ3

125

19

2ˆ4

16

20

3ˆ4

81

21

4ˆ4

256

22

5ˆ4

625

23

2ˆ5

32

24

3ˆ5

243

25

2ˆ6

64

26

Square root of 1

1

27

Square root of 2

1.4

28

Square root of 3

1.7

29

Square root of 5

2.2

30

Square root of 6

2.4