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Regrouping Ones, Tens and Hundreds

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Basics on the topic Regrouping Ones, Tens and Hundreds

Join Skylar and Henry and find out how to regroup ones, tens and hundreds.

Regrouping Ones, Tens and Hundreds exercise

Would you like to apply the knowledge you’ve learnt? You can review and practice it with the tasks for the video Regrouping Ones, Tens and Hundreds.
  • How many ones blocks are needed to regroup to a tens rod?

    Hints

    You can regroup base ten blocks so they are easier to count.

    • There are 10 tens in 1 hundred.
    • How many ones are in 1 ten?
    • This is 1 ones block.
    • How many of these do you need to highlight to equal 1 ten?
    Solution

    All ten ones blocks needed highlighting.

    You need to regroup 10 ones blocks to make 1 ten.

  • How can we regroup these amounts?

    Hints
    • Start by regrouping the ones.
    • How many tens are in 23?
    • Start by regrouping the ones.
    • How many tens are in 42?
    Solution
    • 2 tens + 3 ones = 23 ones
    • 4 tens + 2 ones = 42 ones
  • Use what you know to regroup the blocks in the picture below.

    Hints

    Start by regrouping the ones. How many tens in thirteen?

    There is one ten in thirteen. How many ones are left?

    The correct answer will equal 83.
    7 tens + 13 ones = 83
    70 + 13 = 83

    Solution

    7 tens + 13 ones = 83

    • First, regroup the ones. 13 ones = 1 ten + 3 ones
    • Next, add the tens. 7 tens + 1 ten = 8 tens
    • The correct answer is: 8 tens + 3 ones = 83*

  • How can you regroup the hundreds?

    Hints

    First, regroup the hundreds to the thousands place value.
    10 hundreds = 1 thousand.

    12 hundreds is equal to 1 thousands block + 2 hundreds blocks.

    Solution

    Remember, 10 hundreds = 1 thousand, so if you regroup these hundreds, you get:

    • 12 hundreds = 1 thousand + 2 hundreds = 1,200
    • 15 hundreds = 1 thousand + 5 hundreds = 1,500
    • 20 hundreds = 2 thousands = 2,000
    • 23 hundreds = 2 thousands + 3 hundreds = 2,300
  • How many tens make one hundred?

    Hints
    • 10 ones are the same amount as 1 ten.
    • How many tens are the same amount as 1 hundred?
    • This is 1 tens block.
    • How many of these do you need to highlight to equal 1 hundred?
    Solution

    All ten tens rods needed highlighting.

    To make one hundred, you regroup 10 tens rods.

  • Use what you know to regroup the blocks in the picture below.

    Hints

    First, regroup the ones. How many tens are in 12 ones?

    Next, regroup the tens into hundreds. Remember: there are 10 tens in 1 hundred.

    Finally, regroup the hundreds into thousands. 10 hundreds is equal to 1 thousand.

    Solution

    You can regroup the ones into tens, the tens into hundreds and the hundreds into thousands to equal 1,462.