Rounding Numbers

Lesson 29

Math Vocabulary

To “round” a # means:To use the “strength” of numbers to change or keep

another number’s value, so that the entire number is not exact but close to the original

Two types of #s

Strong Numbers:56789

*Have the strength to CHANGE a number (+1)

Weak Numbers:01234

**Have no strength and keep numbers the same

Rounding Numbers

Steps:1. Identify # to be rounded2. Underline # to be rounded3. Circle # AFTER

underlined # 4. Determine if # AFTER is

strong or weak…5. Round 6. Change remaining #s

AFTER to 0s.

Examples:Round 283 to nearest hundred:

283 ≈300

Round 283 to nearest ten:

283≈280

Rounding Numbers

Step Summary:1) Identify2) Circle3) Determine strength4) ROUND5) Change leftovers to 0s

Examples:Round 39,567,000 to nearest million:

39,567,000 ≈40,000,000

Round 4,367,633 to nearest thousand:

4,367,633 ≈4,368,000

Practice…

a) Round 1760 to the nearest hundred.

b) Round 5489 to the nearest thousand.

c) Round 186,282 to the nearest ten thousand.