AB: recommended BC: required

MB: recommended ON: required

Teacher Resource 6.1 Unit 2 Number Sense pp. C-25–28

New Canadian Edition

JUMP Math™ Copyright © 2018 JUMP Math

NS6-5

Rounding

Students will:

• round whole numbers to the nearest given digit.

AP Book 6.1 pp. 32–34

Draw an arrow showing which ten is closest: to….13, 17 and 2

Circle 13, 18, 21, and 26 one at a time.

rounding

See p. C-25 for details.

Exercises:

Round to the nearest ten.

a) 14

b) 19

37

between ___ tens and ___ tens

closest ten =

Exercises:

Round to the nearest ten.

a) 3

b) 3472

Discuss 50 as a special case. See p. C-26 for details.

Is 30 closer to 0 or 100?

Repeat for 70.

Which multiples of 10 are closer to 0?

Which are closer to 100?

See p. C-26 for details.

342

356

What digit did you look at to decide?

See p. C-26 for details.

• numbers less than 50 round down to _____.
• numbers more than 50 round up to _____.

What does 50 round to?

When we round to the nearest hundred ...

Exercises:

Round to the nearest hundred.

a) 849

c) 950

See p. C-27 for details.

Numbers can be rounded in a grid.

Example:

Round 12 473 to the nearest thousand.

Hint: If the digit to the right is 0, 1, 2, 3, or 4, we round down.

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

See p. C-27 for details.

I want to round 17 978 to the nearest hundred.

Hint: Do I need to round the 9 up or down?

Exercises:

Round to the stated place value. Use grid paper.

a) 39 673, thousands

b) 12 971, hundreds