. 30 . 70 . 100
.
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