곱셈의 원리 단원 종합

F.1Write a multiplication sentence for each addition.

1. 1
   $4+4=$ $\boxed{}\times \boxed{}=\boxed{}$
2. 2
   $4+4+4=$ $\boxed{}\times \boxed{}=\boxed{}$
3. 3
   $8+8+8+8+8=$ $\boxed{}\times \boxed{}=\boxed{}$
4. 4
   $7+7+7=$ $\boxed{}\times \boxed{}=\boxed{}$

F.2Fill in each box.

1. 5
   $93\times 0=$ ​
2. 6
   $(3\times 2)\times 2=$ $3\times (\boxed{}\times 2)$
3. 7
   $(4\times 3)\times 3=$ $4\times (\boxed{}\times 3)$
4. 8
   $4\times 7=$ $4\times 4+4\times \boxed{}$

F.3F.4Multiply.

1. 9
   $4\times 4\times 7=$ 
2. 10
   $4\times 9\times 2=$ 
3. 11
   $4\times 3\times 4=$ 
4. 12
   $10\times 2\times 5=$ 
5. 13
   $9\times 50=$ 
6. 14
   $20\times 9=$ 

F.4Multiply. (continued)

1. 15
   $20\times 6=$ 
2. 16
   $9\times 90=$ 

F.5Multiply.

1. 17
   88

   ×2
2. 18
   80

   ×9
3. 19
   57

   ×3
4. 20
   51

   ×7

F.1Repeated Addition & Multiplication

1. 1$2\times 4=8$
2. 2$3\times 4=12$
3. 3$5\times 8=40$
4. 4$3\times 7=21$

F.2Properties of Multiplication

1. 50
2. 62
3. 73
4. 83

F.3F.4Multiply.

1. 9112
2. 1072
3. 1148
4. 12100
5. 13450
6. 14180
7. 15120
8. 16810

F.5Multiply 2-Digit by 1-Digit Numbers

1. 17176
2. 18720
3. 19171
4. 20357