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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( ) ( ) ( ) ( )
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5-5
×
- 56
= 2
× +1 88
= - 7 × 8
① -2 -77
② - -
=
= + 10
2 -2 2
2
+ × 5
+ 8
= - =
+ 2
- + + 8
= - × 8 = + ×
- 3
= - =
+ 9
+ - -
= - × 5 = -
- 6
= + =
+ 3
- - -
= + × 4 = -
-7
③ - 4 × - 4 ④ - 9 × 7
2 -4 2 -4 2
-
-9 2
× 7
16 63
= + × 4 = +
= + 9
= + 4
1 2
2 1 8 1 8 6
⑤ × 8 ⑥ × 6
1 9
⑦ 1 99 × 2 -55 ⑧ 2 -33 × 9
1 4
⑨ 3 × 4 ⑩ 6 × 4
2 -3 2 -4 2 -6
× 4
12 24
× 9
45 27
6
16 48
-2
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 2 -2 2 -5
2 -7
① - 7
2
× - 5
= - 7 × 8 = +
× + 8 ② - 2
2 × 5
= - 56 = + 10
-7
③ - 4-4 × -2 -44 ④ -2 -99 2
× - 7
= + 4 × 4 = + 9 × 7
= + 16 = + 63
1 6
⑤ - 2 × + 8 ⑥ +
2 -2 1 8 1 8
8 × + 6
= - 2 × 8 = + 8 × 6
= - 16 = + 48
1 9
⑦ + 9 × - 5 ⑧ -
1 9 2 -5 2 -3
3 × + 9
= - 9 × 5 = - 3 × 9
= - 45 = - 27
1 4
⑨ - 3 × - 4 ⑩ -
2 -3 2 -4 2 -6
6 ×
= + 12 = - 24
+ 4
= + 3 × 4 = - 6 × 4