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Assess Yourself

How well do you understand the ideas in this lesson?

Goal:

Goal:

monkey with checkmark and cross

Show What You Know!

Assess how well you met your goals.

Are you ready to take this lesson's quiz? These questions will help you find out. Go back to the lesson if you don't know an answer.

Which number line helps you estimate the sum of 7 + 19?

  1. Number line: 0 through 100, with 2 black dots on 55 and 91.
  2. Number line: 0 through 100, with 2 black dots on 3 and 42.

Great job! This number line helps you estimate 7 + 19.

Sorry, this is not the correct number line.

Sorry, this is not the correct number line.

How can you estimate the sum of 68 + 32?

Number line: 0 through 100, and a black dot on 32 and 68.

  1. 80 + 40
  2. 20 + 50

Very good! Adding these benchmark numbers will help you estimate the sum.

Sorry, those are not the correct benchmark numbers.

Sorry, those are not the correct benchmark numbers.

Estimate 91 + 2.

Number line: 0 through 100, with a black dot on 91.

  1. 30 + 20 = 50
  2. 10 + 70 = 80

Sorry, that’s not right. The estimated sum is 90.

Sorry, that’s not right. The estimated sum is 90.

You’re right! The estimated sum is 90.

Which number line helps you estimate the sum of 56 + 81?

  1. Number line: 0 through 100, with 2 black dots on 12 and 82.
  2. Number line: 0 through 100, with 2 black dots on 21 and 71.

Sorry, this is not the correct number line.

Great job! This number line will help you estimate 56 + 81.

Sorry, this is not the correct number line.

How can you estimate the sum of 2 + 63?

Number line: 0 through 100, and a black dot on 2 and 63.

  1. 10 + 20
  2. 30 + 50

Sorry, those are not the correct benchmark numbers.

Sorry, those are not the correct benchmark numbers.

Very good! Adding these benchmark numbers will help you estimate the sum.

Estimate 37 + 9.

Number line: 0 through 100, with 2 black dots on 9 and 37.

  1. 20 + 10 = 30
  2. 50 + 20 = 70

Sorry, that’s not right. The estimated sum is 50.

You’re right! The estimated sum is 50.

Sorry, that’s not right. The estimated sum is 50.

Which number line will help you estimate the sum of 42 + 16?

  1. Number line: 0 through 100, with 2 black dots on 3 and 62.
  2. Number line: 0 through 100, with 2 black dots on 35 and 55.

Great job! This number line will help you estimate 42 + 16.

Sorry, this is not the correct number line.

Sorry, this is not the correct number line.

How can you estimate the sum of 9 + 54?

Number line: 0 through 100, and a black dot on 9 and 54.

  1. 0 + 20
  2. 30 + 20

Sorry, those are not the correct benchmark numbers.

Sorry, those are not the correct benchmark numbers.

Very good! Adding these benchmark numbers will help you estimate the sum.

Estimate 73 + 27.

Number line: 0 through 100, with 2 black dots on 27 and 73.

  1. 20 + 10 = 30
  2. 40 + 40 = 80

You’re right! The estimated sum is 100.

Sorry, that’s not right. The estimated sum is 100.

Sorry, that’s not right. The estimated sum is 100.

Which number line will help you estimate the sum of 25 + 52?

  1. Number line: 0 through 100, with 2 black dots on 27 and 61.
  2. Number line: 0 through 100, with 2 black dots on 21 and 71.

Sorry, this is not the correct number line.

Great job! This number line will help you estimate 25 + 52.

Sorry, this is not the correct number line.

Summary

Questions answered correctly:

Questions answered incorrectly: