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Number Trail Grade 5 / Week 02 / Thursday
4/6
Week 02 · Decimals to thousandths

Thursday

Lizzy's rain gauge
// Read, write, compare and round
⏱ about 15 min

Thursday: Lizzy's rain gauge

Chris the Coyote gathers everyone under the big oak tree.

"Last spring, Lizzy the Lizard set out a rain gauge," he says.

"After one storm, it showed 1.37 centimeters of rain."

"Lizzy wanted to tell Bennie, but she did not need every digit."

"She said, about 1.4 centimeters. That is close enough for a weather report."

"Bennie asked how she chose 1.4," Chris goes on.

"Lizzy said 1.37 is closer to 1.4 than to 1.3 on a number line."

"That is rounding to the nearest tenth," says Chris with a smile.

Learn it: round to a place

A number line from 1.30 to 1.40 with a dot at 1.37

1.37 is between 1.3 and 1.4.

Look at the digit to the right of the tenths place. It is 7.

7 is 5 or more, so we round up to 1.4.

If that digit is 4 or less, we round down.

We can round to any place.

Round 2.648 to the nearest hundredth: the thousandths digit is 8, so it rounds to 2.65.

Round 2.648 to the nearest whole number: the tenths digit is 6, so it rounds to 3.

QUESTIONS ABOUT THE STORY
  • Read the question.
  • Tap your answer.
RainLizzy's gauge showed 1.37 cm of rain. What is that to the nearest tenth?
Which digit tells us how to round 1.37 to the nearest tenth?
The next storm left 2.83 cm of rain. What is that to the nearest tenth?
ROUND TO THE NEAREST TENTH
  • Read the question.
  • Tap your answer.
Round 4.62 to the nearest tenth.
Round 0.75 to the nearest tenth.
Round 9.04 to the nearest tenth.
Round 3.951 to the nearest tenth.
ROUND TO THE NEAREST HUNDREDTH
  • Read the question.
  • Tap your answer.
Round 2.648 to the nearest hundredth.
Round 0.312 to the nearest hundredth.
Round 5.005 to the nearest hundredth.
Round 7.996 to the nearest hundredth.
ROUND TO THE NEAREST WHOLE NUMBER
  • Read the question.
  • Tap your answer.
Round 6.5 to the nearest whole number.
Round 12.38 to the nearest whole number.
Round 0.91 to the nearest whole number.
A stick is 19.702 cm long. About how many whole centimeters is that?
SentenceTrue or false?
4.36 rounded to the nearest tenth is 4.4.?
8.214 rounded to the nearest hundredth is 8.22.?
0.45 rounded to the nearest tenth is 0.5.?
3.49 rounded to the nearest whole number is 4.?
WHY THIS EXERCISE8.214 rounds to 8.21, and 3.49 rounds to 3.
Try it
Use a ruler to measure a pencil, a spoon and a book in centimeters.
Write each length with tenths, like 14.6 cm.
Round each length to the nearest whole centimeter.
Draw a number line from 2.8 to 2.9 and show where 2.83 rounds.

What a story! Tomorrow Freddy has a review game.

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