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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4-4
× + 56
= 4
× +1 88
= + 7 × 8
① +1 77
② + -
=
= - 16
1 4 2
4
- × 4
- 5
= + =
+ 4
+ + - 5
= + × 7 = - ×
- 7
= - =
- 3
+ - +
= - × 5 = -
- 7
= - =
- 8
+ - +
= - × 1 = -
-2
③ + 6 × + 1 ④ - 7 × 2
1 6 1 1 2
-
-7 2
× 2
6 14
= + × 1 = +
= + 7
= + 6
1 4
1 1 7 2 -5 7
⑤ × 7 ⑥ × 7
2 -5
⑦ 1 33 × 2 -55 ⑧ 1 77 × 5
2 -8
⑨ 8 × 1 ⑩ 7 × 8
1 8 2 -1 1 7
× 8
8 56
× 5
15 35
7
28 35
4
正の数、負の数の乗法
次の計算をしましょう。
( ) ( ) ( ) ( )
( ) ( )
( ) ( ) ( ) ( )
( ) ( )
( ) ( ) ( ) ( )
( ) ( )
( ) ( ) ( ) ( )
( ) ( )
( ) ( ) ( ) ( )
( ) ( )
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1 8 1 4 2 -4
1 7
① + 7
1
× - 4
= + 7 × 8 = -
× + 8 ② + 4
4 × 4
= + 56 = - 16
-2
③ + 66 × +1 11 ④ -2 -77 2
× - 2
= + 6 × 1 = + 7 × 2
= + 6 = + 14
1 7
⑤ + 4 × + 7 ⑥ -
1 4 1 7 2 -5
5 × + 7
= + 4 × 7 = - 5 × 7
= + 28 = - 35
2 -5
⑦ + 3 × - 5 ⑧ +
1 3 2 -5 1 7
7 × - 5
= - 3 × 5 = - 7 × 5
= - 15 = - 35
2 -8
⑨ + 8 × - 1 ⑩ +
1 8 2 -1 1 7
7 ×
= - 8 = - 56
- 8
= - 8 × 1 = - 7 × 8