Estimating Numbers Lesson 29
Math Vocabulary To “estimate” a # means: A close guess of the actual value, usually with some thought or calculation involved (based on “rounding”)
Two types of #s Strong Numbers: *Have the strength to CHANGE a number (+1) Weak Numbers: **Have no strength and keep numbers the same
Rounding Numbers Steps: 1) Identify # to estimate 2) Underline # to estimate 3) Circle # after 4) Determine strength of circled # 5) Estimate 6) Change ending #s to 0s Examples: Estimate 6143: 6143 ≈ 6000 Estimate 4952: 4952 ≈ 5000
Estimating Numbers Example: Estimate the sum of 3562 and ≈ Example: Estimate the product of 58 and x 194 ≈ 60 x ,000
Practice… a) Estimate 34,527. b) Estimate 567,982. c) Estimate the sum of 45,673 and 54,926. d) Estimate the difference of 826 and 275.