Grade 5 - Number
Standard 5.N.2 - Round numbers up to 100,000.
Included Skills: Estimation
Use estimation strategies including: • front-end rounding • compensation • compatible numbers in problem-solving contexts. • Achievement Indicators - Provide a context for when estimation is used to: • make predictions • check reasonableness of an answer • determine approximate answers. - Describe contexts in which overestimating is important. - Determine the approximate solution to a given problem not requiring an exact answer. - Estimate a sum or product using compatible numbers. - Estimate the solution to a given problem using compensation and explain the reason for compensation. - Select and use an estimation strategy for a given problem. - Apply front-end rounding to estimate: • sums, e.g., 253 + 615 is more than 200 + 600 = 800 • differences, e.g., 974 – 250 is close to 900 – 200 = 700 • products, e.g., the product of 23 × 24 is greater than 20 × 20 (400) and less than 25 × 25 (625) • quotients, e.g., the quotient of 831 ÷ 4 is greater than 800 ÷ 4 (200).