正の数、負の数の乗法
次の計算をしましょう。
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( ) ( )
( ) ( ) ( ) ( )
( ) ( )
( ) ( ) ( ) ( )
( ) ( )
( ) ( ) ( ) ( )
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7-7
×
- 27
= 3
× +1 99
= - 3 × 9
① -2 -33
② - -
=
= + 21
2 -3 2
3
+ × 7
- 2
= - =
+ 6
- + - 2
= - × 7 = - ×
+ 4
= - =
+ 7
+ - +
= - × 1 = +
- 2
= - =
+ 4
- + -
= - × 5 = -
-4
③ - 7 × + 8 ④ + 9 × 4
2 -7 1 8 1
-
9 2
× 4
56 36
= - × 8 = -
= - 9
= - 7
1 6
2 1 7 2 -2 4
⑤ × 7 ⑥ × 4
1 6
⑦ 1 77 × 2 -11 ⑧ 1 44 × 6
1 7
⑨ 4 × 5 ⑩ 2 × 7
2 -4 1 5 2 -2
× 7
20 14
× 6
7 24
4
42 8
-6
正の数、負の数の乗法
次の計算をしましょう。
( ) ( ) ( ) ( )
( ) ( )
( ) ( ) ( ) ( )
( ) ( )
( ) ( ) ( ) ( )
( ) ( )
( ) ( ) ( ) ( )
( ) ( )
( ) ( ) ( ) ( )
( ) ( )
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1 9 2 -3 2 -7
2 -3
① - 3
2
× - 7
= - 3 × 9 = +
× + 9 ② - 3
3 × 7
= - 27 = + 21
-4
③ - 7-7 × +1 88 ④ +1 99 2
× - 4
= - 7 × 8 = - 9 × 4
= - 56 = - 36
1 4
⑤ - 6 × + 7 ⑥ -
2 -6 1 7 2 -2
2 × + 4
= - 6 × 7 = - 2 × 4
= - 42 = - 8
1 6
⑦ + 7 × - 1 ⑧ +
1 7 2 -1 1 4
4 × + 6
= - 7 × 1 = + 4 × 6
= - 7 = + 24
1 7
⑨ - 4 × + 5 ⑩ -
2 -4 1 5 2 -2
2 ×
= - 20 = - 14
+ 7
= - 4 × 5 = - 2 × 7