Step-by-step Maths Level 3: Adding a 1-digit number with carrying

Method. Add the ones, then the tens, then the hundreds. Carry any ten or hundred you make.

1. Write the numbers in columns. Keep the ones under the ones and the tens under the tens.
   52 over 9
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   2 + 9 = 11, write 1 and carry 1
3. Add the tens. Add the carried ten with the tens.
   5 + 0 + 1 carried = 6
4. Write the answer. Read the columns from left to right.
   61

Check. Check: 61 - 9 = 52.

Watch out. When the ones make 10 or more, carry a ten to the tens column. Do not forget it.

Method. Add the ones, then the tens, then the hundreds. Carry any ten or hundred you make.

1. Write the numbers in columns. Keep the ones under the ones and the tens under the tens.
   415 over 7
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   5 + 7 = 12, write 2 and carry 1
3. Add the tens. Add the carried ten with the tens.
   1 + 0 + 1 carried = 2
4. Add the hundreds. Add any carried hundred too.
   4 + 0 = 4
5. Write the answer. Read the columns from left to right.
   422

Check. Check: 422 - 7 = 415.

Watch out. When the ones make 10 or more, carry a ten to the tens column. Do not forget it.

Method. Add the ones, then the tens, then the hundreds. Carry any ten or hundred you make.

1. Write the numbers in columns. Keep the ones under the ones and the tens under the tens.
   656 over 4
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   6 + 4 = 10, write 0 and carry 1
3. Add the tens. Add the carried ten with the tens.
   5 + 0 + 1 carried = 6
4. Add the hundreds. Add any carried hundred too.
   6 + 0 = 6
5. Write the answer. Read the columns from left to right.
   660

Check. Check: 660 - 4 = 656.

Watch out. When the ones make 10 or more, carry a ten to the tens column. Do not forget it.

Method. Add the ones, then the tens, then the hundreds. Carry any ten or hundred you make.

1. Write the numbers in columns. Keep the ones under the ones and the tens under the tens.
   95 over 9
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   5 + 9 = 14, write 4 and carry 1
3. Add the tens. Add the carried ten with the tens. The tens make 10 or more, so write the tens digit and carry 1 hundred.
   9 + 0 + 1 carried = 10
4. Add the hundreds. Add any carried hundred too.
   0 + 0 + 1 carried = 1
5. Write the answer. Read the columns from left to right.
   104

Check. Check: 104 - 9 = 95.

Watch out. When the tens make 10 or more, carry a hundred to the hundreds column.

Method. Add the ones, then the tens, then the hundreds. Carry any ten or hundred you make.

1. Write the numbers in columns. Keep the ones under the ones and the tens under the tens.
   477 over 3
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   7 + 3 = 10, write 0 and carry 1
3. Add the tens. Add the carried ten with the tens.
   7 + 0 + 1 carried = 8
4. Add the hundreds. Add any carried hundred too.
   4 + 0 = 4
5. Write the answer. Read the columns from left to right.
   480

Check. Check: 480 - 3 = 477.

Watch out. When the ones make 10 or more, carry a ten to the tens column. Do not forget it.

Method. Add the ones, then the tens, then the hundreds. Carry any ten or hundred you make.

1. Write the numbers in columns. Keep the ones under the ones and the tens under the tens.
   503 over 7
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   3 + 7 = 10, write 0 and carry 1
3. Add the tens. Add the carried ten with the tens.
   0 + 0 + 1 carried = 1
4. Add the hundreds. Add any carried hundred too.
   5 + 0 = 5
5. Write the answer. Read the columns from left to right.
   510

Check. Check: 510 - 7 = 503.

Watch out. When the ones make 10 or more, carry a ten to the tens column. Do not forget it.

Method. Add the ones, then the tens, then the hundreds. Carry any ten or hundred you make.

1. Write the numbers in columns. Keep the ones under the ones and the tens under the tens.
   978 over 5
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   8 + 5 = 13, write 3 and carry 1
3. Add the tens. Add the carried ten with the tens.
   7 + 0 + 1 carried = 8
4. Add the hundreds. Add any carried hundred too.
   9 + 0 = 9
5. Write the answer. Read the columns from left to right.
   983

Check. Check: 983 - 5 = 978.

Watch out. When the ones make 10 or more, carry a ten to the tens column. Do not forget it.

Method. Add the ones, then the tens, then the hundreds. Carry any ten or hundred you make.

1. Write the numbers in columns. Keep the ones under the ones and the tens under the tens.
   836 over 7
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   6 + 7 = 13, write 3 and carry 1
3. Add the tens. Add the carried ten with the tens.
   3 + 0 + 1 carried = 4
4. Add the hundreds. Add any carried hundred too.
   8 + 0 = 8
5. Write the answer. Read the columns from left to right.
   843

Check. Check: 843 - 7 = 836.

Watch out. When the ones make 10 or more, carry a ten to the tens column. Do not forget it.

Method. Add the ones, then the tens, then the hundreds. Carry any ten or hundred you make.

1. Write the numbers in columns. Keep the ones under the ones and the tens under the tens.
   86 over 8
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   6 + 8 = 14, write 4 and carry 1
3. Add the tens. Add the carried ten with the tens.
   8 + 0 + 1 carried = 9
4. Write the answer. Read the columns from left to right.
   94

Check. Check: 94 - 8 = 86.

Watch out. When the ones make 10 or more, carry a ten to the tens column. Do not forget it.

Method. Add the ones, then the tens, then the hundreds. Carry any ten or hundred you make.

1. Write the numbers in columns. Keep the ones under the ones and the tens under the tens.
   18 over 3
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   8 + 3 = 11, write 1 and carry 1
3. Add the tens. Add the carried ten with the tens.
   1 + 0 + 1 carried = 2
4. Write the answer. Read the columns from left to right.
   21

Check. Check: 21 - 3 = 18.

Watch out. When the ones make 10 or more, carry a ten to the tens column. Do not forget it.

Method. Add the ones, then the tens, then the hundreds. Carry any ten or hundred you make.

1. Write the numbers in columns. Keep the ones under the ones and the tens under the tens.
   725 over 7
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   5 + 7 = 12, write 2 and carry 1
3. Add the tens. Add the carried ten with the tens.
   2 + 0 + 1 carried = 3
4. Add the hundreds. Add any carried hundred too.
   7 + 0 = 7
5. Write the answer. Read the columns from left to right.
   732

Check. Check: 732 - 7 = 725.

Watch out. When the ones make 10 or more, carry a ten to the tens column. Do not forget it.

Method. Add the ones, then the tens, then the hundreds. Carry any ten or hundred you make.

1. Write the numbers in columns. Keep the ones under the ones and the tens under the tens.
   372 over 8
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   2 + 8 = 10, write 0 and carry 1
3. Add the tens. Add the carried ten with the tens.
   7 + 0 + 1 carried = 8
4. Add the hundreds. Add any carried hundred too.
   3 + 0 = 3
5. Write the answer. Read the columns from left to right.
   380

Check. Check: 380 - 8 = 372.

Watch out. When the ones make 10 or more, carry a ten to the tens column. Do not forget it.

Method. Add the ones, then the tens, then the hundreds. Carry any ten or hundred you make.

1. Write the numbers in columns. Keep the ones under the ones and the tens under the tens.
   844 over 8
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   4 + 8 = 12, write 2 and carry 1
3. Add the tens. Add the carried ten with the tens.
   4 + 0 + 1 carried = 5
4. Add the hundreds. Add any carried hundred too.
   8 + 0 = 8
5. Write the answer. Read the columns from left to right.
   852

Check. Check: 852 - 8 = 844.

Watch out. When the ones make 10 or more, carry a ten to the tens column. Do not forget it.

Method. Add the ones, then the tens, then the hundreds. Carry any ten or hundred you make.

1. Write the numbers in columns. Keep the ones under the ones and the tens under the tens.
   528 over 9
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   8 + 9 = 17, write 7 and carry 1
3. Add the tens. Add the carried ten with the tens.
   2 + 0 + 1 carried = 3
4. Add the hundreds. Add any carried hundred too.
   5 + 0 = 5
5. Write the answer. Read the columns from left to right.
   537

Check. Check: 537 - 9 = 528.

Watch out. When the ones make 10 or more, carry a ten to the tens column. Do not forget it.

Method. Add the ones, then the tens, then the hundreds. Carry any ten or hundred you make.

1. Write the numbers in columns. Keep the ones under the ones and the tens under the tens.
   453 over 7
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   3 + 7 = 10, write 0 and carry 1
3. Add the tens. Add the carried ten with the tens.
   5 + 0 + 1 carried = 6
4. Add the hundreds. Add any carried hundred too.
   4 + 0 = 4
5. Write the answer. Read the columns from left to right.
   460

Check. Check: 460 - 7 = 453.

Watch out. When the ones make 10 or more, carry a ten to the tens column. Do not forget it.

Method. Add the ones, then the tens, then the hundreds. Carry any ten or hundred you make.

1. Write the numbers in columns. Keep the ones under the ones and the tens under the tens.
   279 over 2
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   9 + 2 = 11, write 1 and carry 1
3. Add the tens. Add the carried ten with the tens.
   7 + 0 + 1 carried = 8
4. Add the hundreds. Add any carried hundred too.
   2 + 0 = 2
5. Write the answer. Read the columns from left to right.
   281

Check. Check: 281 - 2 = 279.

Watch out. When the ones make 10 or more, carry a ten to the tens column. Do not forget it.