The coaster's top speed has two decimal places, and a sign by the line would have none. Somebody has to decide which way to round.
Not started yet.
By the end of this lesson your student should be able to round a decimal to the nearest whole number, tenth or hundredth by looking at the digit one place to the right.
It is the same rule as rounding whole numbers in U1-L2. The only new thing is the places have new names.
🚨 The carry. Rounding 14.295 to the nearest hundredth turns the 9 into a 10, so the 9 becomes 0 and the 2 becomes 3: 14.30. Students often write 14.3 or 14.2910. Keep the zero, because it shows the number was rounded to hundredths.
Some students look at the wrong digit, the one IN the place instead of the one to its right. Have them underline the place first and circle the digit next door.
Draw a short number line from 64 to 65 with 64.5 marked in the middle, and ask which side 64.77 falls on. Once the student sees the halfway point, the 'five or more rounds up' rule explains itself.
Then do the same between 64.7 and 64.8 for rounding to the nearest tenth. Same picture, one place further in.
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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.