1-3正負數的乘除數位學習單

一、正負數的乘法

1. (−8) × 4 =

2. (−13) × 7 =

3. (−18) × 5 =

4. (−25) × 15 =

5. 4 × (−25) =

6. 7 × (−13) =

二、乘法交換律、結合律的應用

1. 25 × (−63) × (−4) × 2 =

2. 45 × 125 × (−8) × 6 =

三、整數的除法運算

1. (−45) ÷ 3 = ?

15

-15

2. (−92) ÷ 4 = ?

23

-23

3. (−432) ÷ 12 =

4. 540 ÷ (−15) =

四、整數的四則運算

1. (−5)×12 − 6×18

= −

=

2. (−38)+(−7)×8+(−9)×7

= + +

=

3. (−39)÷3×(−4)+6×(−23)

= +

=

五、含括號的整數四則運算

1. 34−(5−12÷3)

= 34 − (5 − )

= 34 −

=

2. [(−4)−25]−16

= − 16

=

3. 1+(2−3)

=

六、含絕對值的整數四則運算

1. |(−6)×(4−14)| − |9×(7−10)|

= |(−6)×| − |9×|

= −

=

2. (−2)×3 − |4+(−7)|

= − ||

= −

=

3. |(−8)+3| − |3−(−5)|

= || − ||

= −

=

4. |8×(−14)| + (−4)×36

= +

=

七、乘法對加(減)法的分配律

1. 54×(−12)+46×(−12)

= () × (−12)

=

2. 273×(−531)+727×(−531)

= () × (−531)

=

3. 123×25−377×25

= () × 25

=

八、乘法對加(減)法分配律的應用

1. 995×(−35) =

2. (−299)×301 =

3. 2001×(−225) =

4. (−23)×599 =