Detailed Explanation of Adding a Two-Digit and a One-Digit Number with Regrouping ✏️

When you add a two-digit number and a one-digit number, sometimes the answer needs regrouping. Regrouping means you need to carry over some ones into the tens place because the ones add up to more than 9.

What is Regrouping? 🤔

Regrouping happens when the total of the ones column is 10 or more. Since we cannot write two digits in the ones place, we put the extra ten into the tens column.

Step-by-Step Guide to Adding a Two-Digit and a One-Digit Number with Regrouping ➕

Let’s look at how to add a two-digit number and a one-digit number, for example:

27 + 5

  1. Start with the ones:
    Look at the ones place in 27, which is 7, and add 5 ones.
    7 + 5 = 12
  2. Regrouping the ones:
    Since 12 is more than 9, we cannot keep both digits in the ones place.

    • Write down 2 in the ones place.
    • Carry 1 ten over to the tens column.
  3. Add the tens:
    Now add the tens place from 27, which is 2 (meaning 20), plus the 1 ten we carried over.
    2 + 1 = 3
  4. Write the answer:
    The tens place is 3 and the ones place is 2, so the total is 32.

Another Example: 46 + 9 ✨

  1. Ones place: 6 + 9 = 15
  2. Write 5 in the ones place and carry over 1 ten.
  3. Tens place: 4 + 1 = 5
  4. Answer: 55

Tips for Adding with Regrouping 💡

  • Always start by adding the ones first.
  • If the sum is 10 or more, remember to carry over to the tens.
  • Write down only the last digit of the ones sum, and carry the rest.
  • Then add the tens, including the carried number.

You are doing great by practising this! Keep trying examples to get better at adding two-digit and one-digit numbers with regrouping.

20 Examination-Style Questions with Answers on Adding Two-Digit and One-Digit Numbers with Regrouping 📝

Here are 20 maths questions focused on adding a two-digit number and a one-digit number with regrouping, perfect for Year 2 students in Key Stage 1 following the UK National Curriculum.

Questions ❓

  1. What is 27 + 5?
  2. Add 34 and 8.
  3. Calculate 49 + 6.
  4. Find the sum of 56 and 7.
  5. What do you get if you add 28 + 9?
  6. Add 67 and 5 together.
  7. What is 35 + 8?
  8. Calculate 48 + 7.
  9. Find the total of 23 and 9.
  10. Add 39 and 6.
  11. What is 58 + 4?
  12. Calculate 44 + 9.
  13. Find the sum of 29 and 8.
  14. Add 36 and 7.
  15. What do you get if you add 53 + 9?
  16. Calculate 31 + 8.
  17. Find the total of 42 and 7.
  18. Add 27 and 9.
  19. What is 65 + 7?
  20. Calculate 54 + 8.

Answers ✅

  1. 27 + 5 = 32
  2. 34 + 8 = 42
  3. 49 + 6 = 55
  4. 56 + 7 = 63
  5. 28 + 9 = 37
  6. 67 + 5 = 72
  7. 35 + 8 = 43
  8. 48 + 7 = 55
  9. 23 + 9 = 32
  10. 39 + 6 = 45
  11. 58 + 4 = 62
  12. 44 + 9 = 53
  13. 29 + 8 = 37
  14. 36 + 7 = 43
  15. 53 + 9 = 62
  16. 31 + 8 = 39
  17. 42 + 7 = 49
  18. 27 + 9 = 36
  19. 65 + 7 = 72
  20. 54 + 8 = 62

These questions encourage practice in adding two-digit and one-digit numbers where regrouping (carrying) is needed, helping build Year 2 students’ confidence with place value and addition strategies.