Chapter 3.2 (Mathematics 5)

Subtraction of up to 6-digit numbers with regrouping

Subtraction of up to 6-digit numbers with regrouping

Group Activity 2

What is 67 832 – 52 672?

In groups of five:

  1. Represent 67 832 on an abacus.
  2. Show subtraction of 52 672 as follows:
    1. Remove 2 rings from the ones.
    2. 7 is greater than 3 in the tens.
      ​Transfer one ring from hundreds place value to tens place value.
      ​Represent it with 10 rings in the tens place values.
      ​Remove 7 rings from the tens.
    3. Remove 6 rings from the hundreds, 2 rings from the thousands, 5 rings from the ten thousands.
    4. Discuss the number represented on the abacus.
    5. Share your results with other groups.

Example 2

Work out: 623 854 – 532 931

  1. Ones: 4 minus 1 is 3.
  2. Tens: 5 minus 3 is 2.
  3. Hundreds: 8 minus 9, not possible. Regroup 1 thousand as 10 hundreds. Add the 10 hundreds to 8 hundreds.
  4. 18 minus 9 is 9.
  5. Thousands: 2 minus 2 is 0.
  6. Ten thousands: 2 minus 3 is not possible. Regroup 1 hundred thousand as 10 ten thousands. Add the 10 ten thousands to 2 ten thousands to get 12. 12 minus 3 is 9.
  7. Hundred thousands: 5 minus 5 is 0.

Exercise B

Work out in pairs:

B1

B2

B3

  1. 798 643 – 59 587 = 
  2. 582 794 – 75 365 = 
  3. 926 506 – 732 435 = 

929 672 kg  608 377 kg =  kg

D6

A factory processed 875 000 packets of biscuits. Some of the packets of biscuits were sold to traders and 295 750 packets remained. How many packets of biscuits did the traders buy?

D7

A bakery produced 295 080 loaves of bread. The bakery donated 93 750 loaves of bread to needy families. How many loaves of bread remained?

Digital Time

Subtraction of up to 6-digit numbers with regrouping