Year 3 Exam > Year 3 Notes > Year 3 Mathematics > Add and subtract 2-digit and 1-digit numbers
Add and subtract 2-digit and 1-digit numbers | Year 3 Mathematics PDF Download
Adding a one-digit number and a two-digit number
- Start with the larger number when adding a one-digit number to a two-digit number.
- Count forwards by the value of the smaller number to find the sum.
- For example, 43 (larger number) + 8 (smaller number) = 51
- You could find the number on a number square and count forwards. Find number 43, then count forwards 8 ones to get 51.
Subtracting a one-digit number from a two-digit number
- When subtracting a one-digit number from a two-digit number, start with the larger number and count backwards.
- For instance, 43 - 8 = 35.
- Use the 100 square for visual aid.
Question for Add and subtract 2-digit and 1-digit numbersTry yourself: When adding a one-digit number to a two-digit number, what should you start with?View Solution
Adding Two Two-Digit Numbers
- When adding two two-digit numbers, it's helpful to break down the numbers into their tens and ones.
- For example, let's add 55 and 34:
- First, add the tens: 5 tens + 3 tens = 8 tens (50 + 30 = 80).
- Next, add the ones: 5 ones + 4 ones = 9 ones (5 + 4 = 9).
- Finally, combine the results to get the total: 80 + 9 = 89.
Subtracting Two-Digit Numbers from Two-Digit Numbers
- When subtracting a two-digit number from another, start by counting back the tens of the smaller number.
- Let's consider 58 - 44:
- Since 44 has 4 tens, count back 4 tens from 58:
- 58, 48, 38, 28, 18.
- Then, count back the ones: 18 - 4 = 14.
- Therefore, 58 - 44 = 14.
- Since 44 has 4 tens, count back 4 tens from 58:
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FAQs on Add and subtract 2-digit and 1-digit numbers - Year 3 Mathematics
| 1. How can I add a one-digit number to a two-digit number? |  |
Ans. To add a one-digit number to a two-digit number, first, write both numbers vertically, aligning the ones place. Then, add the digits in the ones place, carrying over if the sum is greater than 9. Finally, add the digits in the tens place and any carried-over value to get the final sum.
| 2. How do I subtract a one-digit number from a two-digit number? | |
Ans. To subtract a one-digit number from a two-digit number, write both numbers vertically, aligning the ones place. Then, subtract the digits in the ones place. If needed, borrow from the tens place to ensure subtraction can be completed. Finally, subtract the digits in the tens place to get the final difference.
| 3. What is the process for adding two two-digit numbers? | |
Ans. To add two two-digit numbers, write both numbers vertically, aligning the ones place. Then, add the digits in the ones place, carrying over if the sum is greater than 9. Next, add the digits in the tens place and any carried-over value to get the final sum.
| 4. How can I subtract two-digit numbers from two-digit numbers? | |
Ans. To subtract one two-digit number from another, write both numbers vertically, aligning the ones place. Then, subtract the digits in the ones place. If needed, borrow from the tens place to ensure subtraction can be completed. Finally, subtract the digits in the tens place to get the final difference.
| 5. How can I add and subtract 2-digit and 1-digit numbers effectively? | |
Ans. To add and subtract 2-digit and 1-digit numbers effectively, practice aligning the numbers properly and following the steps for addition and subtraction. Remember to carry over or borrow when necessary and double-check your calculations for accuracy. Regular practice will help improve your skills in handling these types of calculations.
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Nov 17, 2024 Last updated |
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