Math Games

Grade 5 - Number

Standard 5.N.2 - Practice estimating subtraction equations by first rounding the numbers then finding the difference.

Included Skills:

Use estimation strategies in problem-solving contexts.
• Provide a context for when estimation is used to:
- make predictions.
- check the 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).