Что узнали. Чему научились.
76 + 5 — 20 = 61 верно
76 + 5 — 20 = 81 — 20 = 61
90 — 34 + 8 = 56 неверно
90 — 34 + 8 = 56 + 8 = 64
35 + 8 — 30 = 13 верно
35 + 8 — 30 = 43 — 30 = 13
50 — 35 — 8 = 7 верно
50 — 35 — 8 = 15 — 8 = 7
80 — 66 — 9 = 8 неверно
80 — 66 — 9 = 14 — 9 = 5
30 — 27 — 3 = 0 верно
30 — 27 — 3 = 3 — 3 = 0
28 + 9 = 37
86 — 80 = 6
45 + 9 = 54
37 — 9 = 28 6 + 80 = 86 54 — 9 = 45
37 — 28 = 9 86 — 6 = 80 54 — 45 = 9
35 — 6 = 29
57 + 40 = 97
63 — 4 = 59
29 + 6 = 35 97 — 57 = 40 59 + 4 = 63
35 — 29 = 6 97 — 40 = 57 63 — 59 = 4
15 — (
7 + 2)
= 6 31 — (
10 — 4 + 3)
= 22
17 — (
8 + 2)
= 7 58 — (
20 + 6)
— 32 = 0
72 +
8 -
35 = 45 62 -
20 +
7 = 49
54 -
9 -
20 = 25 36 +
30 -
8 = 58
1) К числу прибавить разность двух чисел.
2) Из числа вычесть сумму двух чисел.
1)
5 + (40 — 35) = 5 + 5 = 10
2)
20 — (7 + 13) = 20 — 20 = 0
90 — 45 >
90 — 47 (45 > 43)
60 — 23 <
70 - 23 (37 < 47)
48 + 20 =
70 - 2 (68 = 68)
62 + 8
= 70 22
+ 8 = 30 15
- 6 = 9
40 + 7 + 3 + 18 = 40 + 10 + 18 = 50 + 18 = 68
50 + 26 + 8 + 2 = 50 + 26 + 10 = 60 + 26 = 86
30 + 9 + 6 + 1 = 30 + 10 + 6 = 40 + 6 = 46
80 - (35 - 20) = 80 - 15 = 80 - 10 - 5 = 70 - 5 = 65
80 - (35 + 20) = 80 - 55 = 80 - 50 - 5 = 30 - 5 = 25
80 + (35 - 20) = 80 + 15 = 80 + 10 + 5 = 90 + 5 = 95
Цепочка.
5 + 10 = 15
15 - 7 = 8
8 + 4 = 12
12 - 5 = 7
7 + 4 = 11
11 - 6 = 5
5 + 5 = 10