Unit 2a Review

Unit 2a Review

Number Lines

• Number lines have numbers marked at different intervals.

• We can use number lines in many ways.

• We can practice plotting a number on a number line.

• Number lines can help us round.

Multiple Choice

Which number line best represents Point P as the number 182?

Multiple Choice

Which number line best represents point P as the number 2,280?

Missing Intervals

Sometimes a number line will not have all of the intervals marked.  Be sure to label missing numbers.  The next number line is an example of a number line with missing numbers. 

Multiple Select

What numbers are missing? Pick 2 answers!

• 20,000

• 25,000

• 30,000

• 40,000

• 50,000

Multiple Select

The number line shows 3 points labeled. Which statements are true? Check all correct answers.

• Point R represents 20,900

• Point R represents 29,300

• Point S represents 26,560

• Point S represents 33,150

• Point T represents 48,400

Rounding

• When we round we use a number that is close but easier to work with. 

• Number lines can help us round.

• We round up or down to the nearest 10, 100, 1,000, or 10,000.

Multiple Choice

Use the number line to round. What is 46 rounded to the nearest 10?

• 40

• 45

• 50

• 55

Multiple Choice

What is 364 rounded to the nearest 100?

• 360

• 300

• 350

• 400

Multiple Choice

The number line shows 4 points labeled. Which number rounds to 1,000 when rounded to the nearest 100?

• 850

• 880

• 930

• 950

Don't be fooled...

Watch out for NOT questions!

Multiple Choice

The number line shows 63 labeled. Sixty-three rounds to 60 when rounded to the nearest 10. Which other number does NOT round to 60?

• 65

• 64

• 62

• 61