NZ Level 3
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Round numbers (to 10's or 100's)
Lesson

Round to the nearest $10$10

To round a number to the nearest $10$10 means to find the $10$10's place value that a number is closest to.

Watch the video below to see some examples of rounding to the nearest $10$10.  Can you spot a number that is close to two different $10$10's values?  What should you do?

Rounding to the Nearest $10$10


• Find which $10$10 a number is closest to ( a $10$10 is a number like $10$10,$20$20,$30$30,$40$40, … $310$310, $320$320, $330$330, $1530$1530, … and so on)

•If a number is exactly in the middle, round to the higher number.

Round to the nearest $100$100

To round a number to the nearest 100 is similar to rounding to the nearest $10$10.  When rounding to the nearest $100$100, find the $100$100's place value that a number is closest to.  

Watch some examples and do some practice in the video below.  Stay until the end for an extra challenge!

Did you see how similar the rules are for rounding to the nearest $100$100?  Read the rules below and compare them to the rules for rounding to the nearest $10$10.

Rounding to the Nearest $100$100

• Find which $100$100 a number is closest to ( a $100$100 is a number like $100$100, $200$200, $300$300, $400$400, … $3100$3100, $3200$3200, $3300$3300, and so on)

•If a number is exactly in the middle, round to the higher number.

 

Practice questions

Question 1

Round $54$54 to the nearest ten.

Question 2

Round $370$370 to the nearest hundred.

Question 3

Three numbers have been rounded as follows:

$3600$3600 rounds to $3600$3600, $3470$3470 rounds to $3470$3470, and $2887$2887 rounds to $2890$2890.

  1. What have the numbers been rounded to?

    The nearest hundred

    A

    The nearest ten

    B

    The nearest hundred

    A

    The nearest ten

    B

Outcomes

NA3-4

Know how many tenths, tens, hundreds, and thousands are in whole numbers.

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