Step-by-step Maths Level 3 Adding within 1000: check-up and practice test questions

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.
   43 over 85
2. Add the ones. The ones make less than 10, so no ten is carried.
   3 + 5 = 8
3. Add the tens. There is no carried ten to add. The tens make 10 or more, so write the tens digit and carry 1 hundred.
   4 + 8 = 12
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.
   128

Check. Check: 128 - 85 = 43.

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

Method. Find the operation, then work out the total.

1. Find the operation. We are putting two amounts together, so we add.
   372 + 109
2. Work out the total. Use column addition with the ones first.
   372 + 109 = 481
3. Write the answer. This is the total in the question.
   481

Check. Check: 481 - 109 = 372.

Watch out. Look for words like more, altogether and in all. These mean add.

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.
   521 over 9
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   1 + 9 = 10, write 0 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.
   530

Check. Check: 530 - 9 = 521.

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

Method. Find the operation, then work out the total.

1. Find the operation. We are putting two amounts together, so we add.
   126 + 257
2. Work out the total. Use column addition with the ones first.
   126 + 257 = 383
3. Write the answer. This is the total in the question.
   383

Check. Check: 383 - 257 = 126.

Watch out. Look for words like more, altogether and in all. These mean add.

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.
   916 over 9
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   6 + 9 = 15, write 5 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.
   9 + 0 = 9
5. Write the answer. Read the columns from left to right.
   925

Check. Check: 925 - 9 = 916.

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.
   356 over 80
2. Add the ones. The ones make less than 10, so no ten is carried.
   6 + 0 = 6
3. Add the tens. There is no carried ten to add. The tens make 10 or more, so write the tens digit and carry 1 hundred.
   5 + 8 = 13
4. Add the hundreds. Add any carried hundred too.
   3 + 0 + 1 carried = 4
5. Write the answer. Read the columns from left to right.
   436

Check. Check: 436 - 80 = 356.

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

Method. Find the operation, then work out the total.

1. Find the operation. We are putting two amounts together, so we add.
   74 + 193
2. Work out the total. Use column addition with the ones first.
   74 + 193 = 267
3. Write the answer. This is the total in the question.
   267

Check. Check: 267 - 193 = 74.

Watch out. Look for words like more, altogether and in all. These mean add.

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.
   437 over 309
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   7 + 9 = 16, write 6 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.
   4 + 3 = 7
5. Write the answer. Read the columns from left to right.
   746

Check. Check: 746 - 309 = 437.

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.
   686 over 96
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   6 + 6 = 12, write 2 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.
   8 + 9 + 1 carried = 18
4. Add the hundreds. Add any carried hundred too.
   6 + 0 + 1 carried = 7
5. Write the answer. Read the columns from left to right.
   782

Check. Check: 782 - 96 = 686.

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.
   31 over 99
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   1 + 9 = 10, write 0 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.
   3 + 9 + 1 carried = 13
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.
   130

Check. Check: 130 - 99 = 31.

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.
   68 over 50
2. Add the ones. The ones make less than 10, so no ten is carried.
   8 + 0 = 8
3. Add the tens. There is no carried ten to add. The tens make 10 or more, so write the tens digit and carry 1 hundred.
   6 + 5 = 11
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.
   118

Check. Check: 118 - 50 = 68.

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.
   77 over 85
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   7 + 5 = 12, write 2 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.
   7 + 8 + 1 carried = 16
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.
   162

Check. Check: 162 - 85 = 77.

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.
   636 over 35
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   6 + 5 = 11, write 1 and carry 1
3. Add the tens. Add the carried ten with the tens.
   3 + 3 + 1 carried = 7
4. Add the hundreds. Add any carried hundred too.
   6 + 0 = 6
5. Write the answer. Read the columns from left to right.
   671

Check. Check: 671 - 35 = 636.

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.
   141 over 9
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   1 + 9 = 10, write 0 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.
   1 + 0 = 1
5. Write the answer. Read the columns from left to right.
   150

Check. Check: 150 - 9 = 141.

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

Method. Find the operation, then work out the total.

1. Find the operation. We are putting two amounts together, so we add.
   307 + 339
2. Work out the total. Use column addition with the ones first.
   307 + 339 = 646
3. Write the answer. This is the total in the question.
   646

Check. Check: 646 - 339 = 307.

Watch out. Look for words like more, altogether and in all. These mean add.

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.
   566 over 61
2. Add the ones. The ones make less than 10, so no ten is carried.
   6 + 1 = 7
3. Add the tens. There is no carried ten to add. The tens make 10 or more, so write the tens digit and carry 1 hundred.
   6 + 6 = 12
4. Add the hundreds. Add any carried hundred too.
   5 + 0 + 1 carried = 6
5. Write the answer. Read the columns from left to right.
   627

Check. Check: 627 - 61 = 566.

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.
   613 over 9
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   3 + 9 = 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.
   6 + 0 = 6
5. Write the answer. Read the columns from left to right.
   622

Check. Check: 622 - 9 = 613.

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.
   45 over 95
2. Add the ones. The ones make 10 or more, so write the ones digit and carry 1 ten.
   5 + 5 = 10, write 0 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.
   4 + 9 + 1 carried = 14
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.
   140

Check. Check: 140 - 95 = 45.

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

Method. Find the operation, then work out the total.

1. Find the operation. We are putting two amounts together, so we add.
   287 + 205
2. Work out the total. Use column addition with the ones first.
   287 + 205 = 492
3. Write the answer. This is the total in the question.
   492

Check. Check: 492 - 205 = 287.

Watch out. Look for words like more, altogether and in all. These mean add.

Method. Find the operation, then work out the total.

1. Find the operation. We are putting two amounts together, so we add.
   435 + 289
2. Work out the total. Use column addition with the ones first.
   435 + 289 = 724
3. Write the answer. This is the total in the question.
   724

Check. Check: 724 - 289 = 435.

Watch out. Look for words like more, altogether and in all. These mean add.