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Assess Yourself

How well do you understand the ideas in this lesson?

Goal:

Goal:

Show What You Know!

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

What is 12 + 5?

number line from 12 to 17 with a dot above 12 and arrows jumping right to 17

  1. 9
  2. 24

The last jump lands on 17, so 12 + 5 = 17.

Yes! The last jump lands on 17, so 12 + 5 = 17.

The last jump lands on 17, so 12 + 5 = 17.

Which open number line helps you solve 57 - 9?

  1. number line from 54 to 57 with a dot above 57 and arrows jumping left to 54
  2. number line from 50 to 57 with a dot above 57 and arrows jumping left to 50

The number line should start at 57 and jump 9 to the left.

The number line should start at 57 and jump 9 to the left.

That is right! This number line starts at 57 and jumps 9 to the left.

How many times do you jump to the right to add 23 + 4?

number line labeled 23 with a dot above it

  1. 3
  2. 9

Correct! You jump 4 to the right because the smaller addend in the addition sentence is 4.

You jump 4 to the right because the smaller addend in the addition sentence is 4.

You jump 4 to the right because the smaller addend in the addition sentence is 4.

What number do you write under this dot to subtract 80 - 6?

open number line

  1. 33
  2. 74

80 is the whole in this subtraction sentence, so you write 80 under this dot.

80 is the whole in this subtraction sentence, so you write 80 under this dot.

Very good! 80 is the whole in this subtraction sentence, so you write 80 under this dot.

What is 36 + 3?

number line from 36 to 39 with a dot above 36 and arrows jumping right to 39

  1. 45
  2. 41

The last jump lands on 39, so 36 + 3 = 39.

Yes! The last jump lands on 39, so 36 + 3 = 39.

The last jump lands on 39, so 36 + 3 = 39.

Which open number line helps you solve 42 - 2?

  1. number line from 72 to 74 with a dot above 74 and arrows jumping left to 72
  2. number line from 39 to 42 with a dot above 42 and arrows jumping left to 39

That is right! This number line starts at 42 and jumps 2 to the left.

The number line should start at 42 and jump 2 to the left.

The number line should start at 42 and jump 2 to the left.

How many times do you jump to the right to add 95 + 4?

number line labeled 95

  1. 5
  2. 8

You jump 4 to the right because the smaller addend in the addition sentence is 4.

You jump 4 to the right because the smaller addend in the addition sentence is 4.

Correct! You jump 4 to the right because the smaller addend in the addition sentence is 4.

What number do you write under this dot to subtract 67 - 6?

open number line

  1. 89
  2. 43

67 is the whole in this subtraction sentence, so you write 67 under this dot.

Very good! 67 is the whole in this subtraction sentence, so you write 67 under this dot.

67 is the whole in this subtraction sentence, so you write 67 under this dot.

What is 22 + 9?

number line from 22 to 31 with a dot above 22 and arrows jumping right to 31

  1. 49
  2. 52

Yes! The last jump lands on 31, so 22 + 9 = 31.

The last jump lands on 31, so 22 + 9 = 31.

The last jump lands on 31, so 22 + 9 = 31.

Which open number line helps you solve 34 - 7?

  1. number line from 32 to 34 with a dot above 34 and arrows jumping left to 32
  2. number line from 30 to 39 with a dot above 39 and arrows jumping left to 30

The number line should start at 34 and jump 7 to the left.

The number line should start at 34 and jump 7 to the left.

That is right! This number line starts at 34 and jumps 7 to the left.

Summary

Questions answered correctly:

Questions answered incorrectly: