1. ?
2. .
2 + 6 3 = 9 2 + 3 = 9 6 + 5 =
5 + 4 2 = 3 + 5 4 = 8 6 2 =
8 3 4 = 7 2 + 4 =
3. .
.
, , ,
? (11 .)
4. ?
?
, , ,
, . . (13 .)
II. .
.
.
1. : 54 + 2 56 4?
, .
, .
: 54 + 2 = 56
, .
: 56 4 = 52
. ( , .)
, .
48 3 = 45 36 + 4 = 40
53 + 5 = 58 27 3 = 24
2. . (32 + 2 = 34; 26 2 = =24.)
3. :
7 + 2 = 9 3 + 4 = 7 9 5 = 4 8 3 = 5
27 + 2 = 29 53 + 4 = 57 39 5 = 34 78 3 = 75
? ?
4. . ? ?
?
: 1) 23 + 4 = 27 (.) ;
2) 27 + 23 = 50 (.) .
5. . (16 + 4 = 20 (); 16 + 20 = 36 ().)
6. , . .
, . .
, , .
7. , .
: 12 + 5 = 17 19 4 = 15 13 + 7 = 20
6 + 10 = 16 16 3 = 13 16 0 = 16
8. .
III. .
.
1. : ) 9 15; ) 12 20; ) 14 8; ) 20 11.
2. .
3. .
13 + 2 = 19 6 = 0 + 12 =
4 + 15 = 18 14 = 5 + 13 =
11 + 8 = 17 10 = 16 4 =
IV. .
?
9
: ; .
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.
: 100, ( ), ( ).
: ; , .
( / ): : ( , ); ; : , ; , ; : , , .