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Lesson · Grade 5 · Mathematics

Adding Big Numbers with Regrouping

  • Grade 5
  • Mathematics
  • 1 min 33 s
  • British Columbia
  • BC5-MA-10

The video adds 357 486 + 249 371 in six place value columns, starting from the ones, and uses place value disks to show that 15 tens make 1 hundred and 5 tens, so we write 5 and carry 1. It carries 1 again in the thousands and ten thousands to get 606 857, checks the answer by rounding to the nearest ten thousand (360 000 + 250 000 = 610 000), and ends on the rule: 10 or more in a place, regroup 10 as 1 in the next place.

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In one sentence

The question this lesson answers

What is 357,486 plus 249,371?

Write one number under the other, with each place lined up.

Transcript

What the lesson says

What is 357,486 plus 249,371?

Write one number under the other, with each place lined up.

Start with the ones: 6 plus 1 is 7.

Next, the tens: 8 plus 7 is 15 tens.

15 tens make 1 hundred and 5 tens, so write 5 and carry 1 hundred.

The hundreds: 1 plus 4 plus 3 is 8.

The thousands: 7 plus 9 is 16, so write 6 and carry 1.

The ten thousands: 1 plus 5 plus 4 is 10, so write 0 and carry 1.

Last, the hundred thousands: 1 plus 3 plus 2 is 6.

So 357,486 plus 249,371 equals 606,857.

To check, round each number to the nearest ten thousand.

360,000 plus 250,000 is 610,000, which is close to 606,857.

When a place adds up to 10 or more, regroup 10 of them as 1 in the next place.

Curriculum

Where this fits

British Columbia, Grade 5

Mathematics, Number: addition and subtraction of whole numbers to 1 000 000BC5-MA-10

Previous: Which is bigger, 0.5 or 0.45?Next: Subtracting Big Numbers: Regrouping Across Zeros

The outcomes and strands follow the British Columbia curriculum.

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