Rounding to the Nearest Ten — Let's Practice!

Rounding to the Nearest Ten — Let's Practice! exercise

• Round two digit numbers to the nearest 10.

  Hints

  Remember, when rounding to the nearest ten, look at the ones.

  If the ones digit is 0, 1, 2, 3 or 4 - round down.

  If the ones digit is 5, 6, 7, 8 or 9 - round up.

  With the number 27, there is a 7 in the ones column. What do we do when the ones are 5, 6, 7, 8 or 9?

  Solution

  Here are the numbers rounded to the nearest 10.

  • 49 = 50
  • 35 = 40
  • 23 = 20
  • 54 = 50

• More rounding to 10.

  Hints

  Remember, when rounding to the nearest ten, look at the ones.

  If the ones digit is 0, 1, 2, 3 or 4 - round down.

  If the ones digit is 5, 6, 7, 8 or 9 - round up.

  In this number, there is a 4 in the ones column. When we round this to the nearest ten, will we round up or down?

  Solution

  The numbers rounded to the nearest 10 are:

  • 44 = 40
  • 29 = 30
  • 164 = 160
  • 145 = 150

• Find the nearest 10.

  Hints

  Look at the digit in the ones column.

  If this is 0, 1, 2, 3 or 4 round down.

  If this is 5, 6, 7, 8 or 9 round up

  Here is the number 45. In the ones column there is a 5. Would we round up or down?

  Solution

  The numbers rounded to the nearest 10 are:

  • 75 = 80
  • 93 = 90
  • 62 = 60
  • 15 = 20

• Round the numbers

  Hints

  Look at the digit in the ones column.

  If this is 0, 1, 2, 3 or 4 round down.

  If this is 5, 6, 7, 8 or 9 round up

  In this number, what digit is in the ones column?

  Try writing the number onto a place value chart to check which digit is in the ones column.

  Solution

  When each number is rounded to the nearest 10:

  • 82 = 80
  • 153 = 150
  • 284 = 280
  • 185 = 190
  • 573 = 570

• Round to the nearest 10.

  Hints

  Look at the digit in the ones column.

  If this is 0, 1, 2, 3 or 4 round down.

  If this is 5, 6, 7, 8 or 9 round up.

  In this number, the ones column has the number 4, so we round down to 50.

  Solution

  These numbers rounded to the nearest 10 are:

  • 24 = 20
  • 56 = 60
  • 28 = 30
  • 132 = 130

• Solve the problems by rounding.

  Hints

  Try looking at the numbers smaller than 460. How small can you go before the number would have to round down to 450 rather than up to 460?

  Look at the ones in the number: 454. Would this number round up to 460 or round down to 450?

  Solution

  When rounding a number to the nearest 10 and reaching 460, the smallest possible number is 455 and the largest posssible number is 464.