Dividend Breaking 10s Worksheet

Reminders & Tips for - Dividend Breaking 10s worksheet:

• A Reminder: you should already know your division table to 100.


• Tips: Fist we "chip off" 10 (or 20, 30...) times the divisor from the dividend, and then deal with the rest.
• Therefore, the quotient of the first dividend-chip (in red in worksheet below) must be divisible by 10 (i.e. = 10, 20, 30...).
• What's left comes right from the division table to 100.


• Comment: Essentially, this is how all division, including the long division, is done.



• Example 1:   42 ÷ 3 = ?


• We "chip off" (10 × 3)  30  from  42
  (we can't chip off 20 or 30 × 3 because that's bigger than 42)


• So, now we have this situation: (30 + 12) ÷ 3


• Following with: 30÷3 + 12÷3


• 30÷3 =  10 (and is divisible by 10)


• and 12÷3 =  4 (is from division table to 100)


• Our solution is 10 + 4 = 14



• Example 2:   54 ÷ 2 = ?


• We "chip off" (20 × 2)  40  from  54
  (20 × 2 is closer to 54 than 10 × 2 = 20, and 30 × 2 = 60 is bigger than 54)


• So, now we have this situation: (40 + 14) ÷ 2


• Following with: 40÷2 + 14÷2


• 40÷2 =  20 (and is divisible by 10)


• and 14÷2 =  7 (is from division table to 100)


• Our solution is 20 + 7 = 27



• Example 3:   78 ÷ 2 = ?


• We "chip off" (30 × 2)  60  from  78
  (30 × 2 is closer to 78 than 10 or 20 × 2, and 40 × 2 = 80 is bigger than 78)


• So, now we have this situation: (60 + 18) ÷ 2


• Following with: 60÷2 + 18÷2


• 60÷2 = 30 (and is divisible by 10)


• and 18÷2 = 9 (is from division table to 100)


• Our solution is 30 + 9 = 19

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Pay attention, please...

   

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