Multiply by 10’s – Set 1

1. Multiply:
20  X 20 = ?

 
 
 
 

2. Multiply:
70  X 30 = ?

 
 
 
 

3. Erin tried to mutiply 50 X 30 by decomposing 50 and 30 into multiples of 10. Her work is below:
50 X 30
= (5 X 10 ) X (3 X 10) Step 1
= (5 X 3) X (10 X 10) Step 2
= 8 X 100   Step 3
= 800 Step 4
Find Erin’s mistake.

 
 
 
 

4. Mia tried to mutiply 80 X 50 by decomposing 80 and 50 into multiples of 10. Her work is below:
80 X 50
= (8 X 10 ) + (5 X 10) Step 1
= (8 X 5) + (10 X 10) Step 2
= 40 + 100   Step 3
= 140 Step 4
Find Mia’s mistake.

 
 
 
 

5. Multiply:
30  X 50 = ?

 
 
 
 

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