Math Games

Grade 5 - Number

Standard 5.N.2 - Round a given number to a specified place value.

Included Skills:

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).