.

30

.

70

.

100

4

15=

8

10=

12

15=

20

25

3

7+

1

6=

25

42

25

42−

1

6=

4

5×

11

12=

11

15

11

15÷

4

5=

27 × 36

27 × 18 =

2.7 × 3.6 =

352 × 48 = 16896

16896 ÷ 24 =

0.427

6

20

15 − 3 × 7 = −6

3 + 5 × 4 = 32

6 × 3 + 2 = 20

28.3 − 1.64 + 0.57

8 +7

10+

91

100

9, 2, 8, 3

+ –

123 45 67 89 = 100

180 = 2 × 2 × 3 × 3 × 5

4𝑥 − 5 = 2𝑥 + 1

𝑥

1

3 of

1

4 of

1

5 of 360 ?

70 = 1 75 = 16 807

71 = 7 76 = 117 649

72 = 49 77 = 823 543

73 = 343 78 = 5 764 801

74 = 2 401

49 × 343 = 16 807

5 764 801

823 543

117 649

2 401

𝟕𝟔

𝟕𝟏𝟐

×

𝒏

𝑛2 0.8𝑛 √𝑛𝑛

0.8

1

𝑛

𝑛

𝒏 = 𝟏

𝒏 = 𝟒