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Lesson · Grade 4 · Mathematics

Adding Four-Digit Numbers with Regrouping

  • Grade 4
  • Mathematics
  • 1 min 26 s
  • British Columbia
  • BC4-MA-07

The video adds 3486 + 2357 one column at a time, starting with the ones. Base ten blocks show 13 ones regrouped as 1 ten and 14 tens regrouped as 1 hundred, each new block becoming the carried 1, while the hundreds (8, less than 10) need no regrouping. It reaches 5843, checks it by rounding to the nearest hundred (3500 + 2400 = 5900, which is close) and ends on the recap that 10 or more in a place regroups as 1 in the next place.

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In one sentence

The question this lesson answers

What is 3486 plus 2357?

Line up the thousands, hundreds, tens and ones.

Transcript

What the lesson says

What is 3486 plus 2357?

Line up the thousands, hundreds, tens and ones.

Start with the ones: 6 plus 7 is 13.

13 ones make 1 ten and 3 ones, so write 3 and carry 1 ten.

Now the tens: 1 plus 8 plus 5 is 14 tens.

14 tens make 1 hundred and 4 tens, so write 4 and carry 1 hundred.

Next, the hundreds: 1 plus 4 plus 3 is 8 hundreds.

8 is less than 10, so just write 8.

Last, the thousands: 3 plus 2 is 5 thousands.

So 3486 plus 2357 equals 5843.

To check, round each number to the nearest hundred.

3500 plus 2400 is 5900, which is close to 5843.

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 4

Mathematics, Number: addition and subtraction to 10 000BC4-MA-07

Previous: Friendly Numbers and Compensating: 2998 + 1456Next: Subtracting Across Zeros: 5003 − 1468

The outcomes and strands follow the British Columbia curriculum.

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