Unit 7 - Lesson 10 - Grade 8: Illustrative Mathematics

Place the numbers on the number line. Be prepared to explain your reasoning.

Trade number lines with a partner, and check each other’s work. How did your partner decide how to place the numbers? If you disagree about a placement, work to reach an agreement.

Which is larger, 4,000,000 or 75 · 105? Estimate how many times larger.

Which is faster, light through diamond or light through ice? How can you tell from the expressions for speed?

Label the tick marks between (2.0) · 108 and (3.0) · 108.Plot a point for each speed on both number lines, and label it with the corresponding material.There is one speed that you cannot plot on the bottom number line. Which is it? Plot it on the top number line instead.

Which is faster, light through ice or light through diamond? How can you tell from the number line?

Describe point B as:A multiple of a power of 10A value

Describe point A as:A multiple of a power of 10A value