Detailed Explanation of Regroup Tens and Ones 🔢

When we talk about regroup tens and ones in Year 2 maths, we mean changing how we group numbers to make adding or subtracting easier. This is a very important skill in the National Curriculum for Key Stage 1 because it helps you understand place value and how numbers work.

What are Tens and Ones? 🎯

Numbers can be made up of tens and ones. For example, the number 34 means 3 tens and 4 ones:

  • 3 tens = 30
  • 4 ones = 4

So, 34 = 30 + 4.

What Does Regrouping Mean? 🔄

Regrouping means moving some ones into a ten, or breaking a ten into ones, to help with adding or subtracting numbers. This is sometimes called “carrying” or “borrowing” in other words, but we say regrouping to make it easier.

Example of Regrouping Tens and Ones ➕

Let’s add 27 + 15:

  1. First, add the ones: 7 + 5 = 12 ones.
  2. Since 12 is more than 10, we can regroup 10 ones to 1 ten and 2 ones are left.
  3. Now add the tens: 2 tens (from 27) + 1 ten (from regrouping) + 1 ten (from 15) = 4 tens.
  4. The answer is 42 (4 tens and 2 ones).

This shows how we move some ones into tens to make adding easier.

Visual Aids Ideas 🧮

To help you understand regrouping tens and ones, you can use:

  • Base ten blocks: Use blocks for tens (like long rods) and ones (small cubes). When you have 10 ones blocks, you can swap them for 1 ten block.
  • Place value charts: A chart with a tens column and a ones column helps you see where to put the numbers.
  • Drawing dots: Draw groups of ten dots and single dots to see how regrouping works when you count.

Why is this Important? ⭐

Learning regroup tens and ones helps you with mental math and understanding how numbers fit together. It is a key part of the Year 2 Maths curriculum and prepares you for more difficult adding and subtracting.

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Remember:
– Tens mean groups of ten.
– Ones mean single units.
– Regrouping moves ones into tens or tens into ones when we add or subtract.

This helps make tricky sums easier and is a super useful skill for maths! 🎉

20 Examination-Style Questions with Answers on Regroup Tens and Ones ✍️📚

Here are 20 questions about regrouping tens and ones, perfect for Year 2 students following the KS1 curriculum. These questions will help you practise your place value skills and understand how to exchange ones for tens and vice versa.

Questions ❓

  1. How many tens and ones are in the number 34?
  2. Write the number that has 5 tens and 7 ones.
  3. If you have 3 tens and 12 ones, what is the correct number when you regroup the ones?
  4. Regroup 25 ones into tens and ones. How many tens and ones do you get?
  5. What is the value of the digit 6 in the number 46?
  6. Write the number shown by 4 tens and 9 ones.
  7. Simon has 17 ones. How many tens and ones does he have if he regroups?
  8. Regroup 53 ones into tens and ones. What is the number now?
  9. Which is bigger: 3 tens and 8 ones or 2 tens and 15 ones after regrouping?
  10. How would you write 4 tens and 11 ones as a normal number?
  11. There are 25 ones in a jar. How many tens can you make and how many ones will be left?
  12. Write the number for 6 tens and 3 ones.
  13. Change 74 ones into tens and ones. What is the answer?
  14. What is 8 tens and 12 ones written as one number?
  15. How many tens and ones make the number 59?
  16. If you have 2 tens and 17 ones, regroup and write the correct number.
  17. Write the number expressed by 7 tens and 4 ones.
  18. If 31 ones are regrouped, how many tens and ones are there?
  19. What number does 5 tens and 10 ones make after regrouping?
  20. How many tens and ones are in the number 68?

Answer Key ✅

  1. 3 tens and 4 ones
  2. 57
  3. 4 tens and 2 ones (42)
  4. 2 tens and 5 ones
  5. 6 is worth 6 ones
  6. 49
  7. 1 ten and 7 ones
  8. 5 tens and 3 ones (53)
  9. 3 tens and 8 ones = 38, 2 tens and 15 ones regrouped is 3 tens and 5 ones = 35, so 38 is bigger
  10. 51
  11. 2 tens and 5 ones
  12. 63
  13. 7 tens and 4 ones (74)
  14. 9 tens and 2 ones (92)
  15. 5 tens and 9 ones
  16. 3 tens and 7 ones (37)
  17. 74
  18. 3 tens and 1 one
  19. 6 tens and 0 ones (60)
  20. 6 tens and 8 ones