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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2-2
× + 8
= 9
× +1 22
= + 4 × 2
① +1 44
② - -
=
= + 18
2 -9 2
9
+ × 2
- 5
= - =
+ 4
- + - 5
= - × 3 = - ×
- 4
= - =
- 6
+ - +
= - × 5 = -
+ 6
= + =
- 6
- - -
= + × 2 = +
2
③ + 3 × - 5 ④ - 2 × 2
1 3 2 -5 2
+
-2 1
× 2
15 4
= - × 5 = -
= - 2
= - 3
1 4
2 1 3 2 -5 9
⑤ × 3 ⑥ × 9
2 -8
⑦ 1 66 × 2 -55 ⑧ 1 44 × 8
2 -7
⑨ 6 × 2 ⑩ 6 × 7
2 -6 2 -2 2 -6
× 7
12 42
× 8
30 32
9
12 45
-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 2 2 -9 2 -2
1 4
① + 4
1
× - 2
= + 4 × 2 = +
× + 2 ② - 9
9 × 2
= + 8 = + 18
2
③ + 33 × -2 -55 ④ -2 -22 1
× + 2
= - 3 × 5 = - 2 × 2
= - 15 = - 4
1 9
⑤ - 4 × + 3 ⑥ -
2 -4 1 3 2 -5
5 × + 9
= - 4 × 3 = - 5 × 9
= - 12 = - 45
2 -8
⑦ + 6 × - 5 ⑧ +
1 6 2 -5 1 4
4 × - 8
= - 6 × 5 = - 4 × 8
= - 30 = - 32
2 -7
⑨ - 6 × - 2 ⑩ -
2 -6 2 -2 2 -6
6 ×
= + 12 = + 42
- 7
= + 6 × 2 = + 6 × 7