A calculator will happily give you a quotient with six decimal places. Nobody can pay that, so you have to know where to stop.
Not started yet.
By the end of this lesson your student should be able to round a decimal quotient to a stated place, round a shared cost up to the next cent, and explain why up is the right direction for money.
🚨 Stopping the division too early. To round to the hundredths you have to divide out to the thousandths, because the digit one place past is the one that decides.
Rounding money down. A student who rounds 3.6625 to $3.66 gets the usual rounding right and still comes up a cent short when four people each pay it.
Make the student multiply the rounded share back by the number of people. Seeing 3.66 x 4 land a cent under the bill is the reason money rounds up, and it works better than being told.
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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.