1. .
2 5 8 11 14
1 4 7 10 13
3 4 5 6 7
3 6 9 12 15
2. .
38 8 + 20 = 30 + 30 + 5 =
70 30 + 5 = 80 20 + 6 =
96 6 70 = 70 + 20 + 7 =
60 40 + 3 = 55 5 + 40 =
3. 15 . 4 9 . ?
II. .
.
11 + 23 44 + 21
11 + 2944 + 28
11 + 25 44 + 23
.
.
III. .
.
1. , . .
16 + 25 = 10 + 20 + 6 + 5 = 30 + 11 = 41
27 + 14 = 20 + 10 + 7 + 4 = 30 + 11 = 41
48 + 15 = 40 + 10 + 8 + 5 = 50 + 13 = 63
35 + 19 = 30 + 10 + 5 + 9 = 40 + 14 = 54
2. : 10; 10; 10, 20. ? .
) + < 10 ) + = 10 ) + > 10
: 1 + 8 < 10 5 + 5 = 10 9 + 8 = 17
2 + 7 < 10 4 + 6 = 10 8 + 7 = 15
3 + 6 < 10 3 + 7 = 10 8 + 7 = 15
4 + 5 < 10 . . 2 + 8 = 10 7 + 6 = 13
1 + 9 = 10 6 + 5 = 11 . .
3. 30? 30? 30? .
+ > 30 + = 30 + < 30
24 + 8 25 + 5 23 + 4
23 + 9 23 + 7 27 + 2
15 + 16 18 + 12 11 + 17
12 + 19
14 + 18
17 + 15
. , , . |
.
4. .
5. . . ?
. ? ? .
7. ?
23 + 45 ( 60 70); 35 + 38 ( 70 80).
?
23 + 45 = 8 35 + 38 = 3
8. .
29 33 23 25
12 12 17 25
41 45 40 50 . .
IV. .
.
1. :
) 10, 30, 50, ____, ____; ) 23, 34, 45, ____, ____;
) 9, 29, 49, ____, ____; ) 18, 15, 12, ____, ____.
2. :
) 14 21; ) 38 45;
) 62 56; ) 94 87.
3. :
.
50
|
|
: , .
.
: , 100 , .
: ; , .
( / ): : ; ; : ; , ; : .