Last lesson took a short number and made it huge. This one takes a huge number and makes it short enough to read.
Not started yet.
By the end of this lesson your student should be able to write a number like 36,000,000 as 3.6 x 10⁷, and turn 1.43 x 10⁵ back into 143,000.
It is U2-L5 run backwards, so if powers of ten are shaky, review that lesson first.
🚨 Stopping in the wrong place. The front number has to be at least 1 and less than 10, so 36 x 10⁶ is not scientific notation even though it equals the right amount. Move the point until exactly one non-zero digit is in front of it.
Miscounting the moves. Have the student put a small mark under each digit the point jumps over, then count the marks.
Write a big number on paper, put your finger on the invisible decimal point at the end, and hop it left one digit at a time while the student counts out loud. The count is the exponent.
Read-aloud is not available in this browser. Try Chrome or Safari.
Before You Start
The words this lesson uses. Tap a card to see what it means, then come back to them whenever a question uses one.
Part One
Questions about the story you just read. Pick your answer straight off, or press Find it in the story if you would rather hunt for the sentence first.
Part Two
The word cards are at the top of this page. Look back at them as often as you need, then answer.