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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 number do you start jumping from to subtract 46 - 15?

number line from 30 to 60 with a dot on 46 and arrows jumping back to 31

  1. 15
  2. 31

You begin jumping from 46 because it is the whole.

You begin jumping from 46 because it is the whole.

Yes! You begin jumping from 46 because it is the whole.

What is 66 - 21?

number line from 40 to 70 with a dot on 66 and arrows jumping back to 45

  1. 27
  2. 53

We start at 66 because it is the whole and jump back 21 because it is the part. The difference is 45.

Correct! We start at 66 because it is the whole and jump back 21 because it is the part. The difference is 45.

We start at 66 because it is the whole and jump back 21 because it is the part. The difference is 45.

Which direction do you jump to subtract on a number line?

  1. Jump to the right.
  2. Jump up and down.

You jump to the left to subtract on a number line.

You jump to the left to subtract on a number line.

Yes! You jump to the left to subtract on a number line.

Which number line helps you subtract 57 - 19?

  1. number line from 30 to 60 with a dot at 57 and arrows jumping back to 32
  2. number line from 30 to 60 with a dot at 57 and arrows jumping back to 49

Good job! This number line has a dot over 57 and jumps 19 to the left. The difference is 38.

The correct number line has a dot over 57 and jumps 19 to the left. The difference is 38.

The correct number line has a dot over 57 and jumps 19 to the left. The difference is 38.

What number do you start jumping from to subtract 85 - 25?

number line from 60 to 90 with a dot on 85 and arrows jumping back to 60

  1. 60
  2. 25

Yes! You begin jumping from 85 because it is the whole.

You begin jumping from 85 because it is the whole.

You begin jumping from 85 because it is the whole.

What is 32 - 27?

number line from 5 to 35 with a dot on 32 and arrows jumping back to 5

  1. 14
  2. 7

We start at 32 because it is the whole and jump 27 because it is the part. The difference is 5.

Correct! We start at 32 because it is the whole and jump 27 because it is the part. The difference is 5.

We start at 32 because it is the whole and jump 27 because it is the part. The difference is 5.

Which number line helps you subtract 70 - 30?

  1. number line from 40 to 70 with a dot at 70 with arrows jumping back to 46
  2. number line from 40 to 70 with a dot at 70 with arrows jumping back to 50

Good job! This number line has a dot over 70 and jumps 30 to the left. The difference is 40.

The correct number line has a dot over 70 and jumps 30 to the left. The difference is 40.

The correct number line has a dot over 70 and jumps 30 to the left. The difference is 40.

What number do you start jumping from to subtract 63 - 22?

number line from 40 to 70 with a dot on 63 and arrows jumping back to 41

  1. 41
  2. 22

You begin jumping from 63 because it is the whole.

You begin jumping from 63 because it is the whole.

Yes! You begin jumping from 63 because it is the whole.

What is 48 -10?

number line from 30 to 60 with a dot on 48 and arrows jumping back to 38

  1. 44
  2. 49

We start at 48 because it is the whole and jump back 10 because it is the part. The difference is 38.

Correct! We start at 48 because it is the whole and jump back 10 because it is the part. The difference is 38.

We start at 48 because it is the whole and jump back 10 because it is the part. The difference is 38.

Which number line helps you subtract 89 - 24?

  1. number line from 60 to 90 with a dot from 89 with arrows jumping back to 67
  2. number line from 60 to 90 with a dot from 79 with arrows jumping back to 68

The correct number line has a dot over 89 and jumps 24 to the left. The difference is 65.

The correct number line has a dot over 89 and jumps 24 to the left. The difference is 65.

Good job! This number line has a dot over 89 and jumps 24 to the left. The difference is 65.

Summary

Questions answered correctly:

Questions answered incorrectly: