Math Games

Grade 5 - Number

Standard 5.N.2 - Round numbers up to 100,000.

Included Skills:

Use estimation strategies including:
• front-end rounding
• compensation
• compatible numbers
in problem-solving contexts.

• Achievement Indicators
• Students who have achieved this outcome(s) should be able to:
- 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).