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Number Trail Grade 4 / Week 10 / Monday
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Week 10 · Tenths and hundredths

Monday

Tenths
// Decimals show parts of a whole
⏱ about 15 min

Monday: Tenths

Lizzy the Lizard tips back her sun hat and peers through her magnifying glass.

"Look at this fern frond," she says. "I want to measure it."

Bennie the Bear brings a meter stick. It is painted in ten equal stripes.

Lizzy lays the frond beside the stick. It covers exactly three stripes.

"Each stripe is one tenth of a meter," says Bennie. "So the frond is three tenths of a meter."

Lizzy writes 3/10 in her notebook. "Is there another way to write it?"

"Yes," says Bennie. "We can write it as a decimal."

Learn it: tenths as decimals

Cut one whole into 10 equal parts. Each part is one tenth.

A bar cut into ten equal parts, three parts shaded

Three tenths is 3/10. As a decimal, it is 0.3.

The dot is a decimal point. The first place after it is the tenths place.

The 0 before the point says there are no whole ones.

A number line from 0 to 1 in tenths, with a dot at 0.3

Decimals can be bigger than 1, too.

Two wholes and 4 tenths is 2 4/10, or 2.4.

WRITE THE DECIMAL
  • Read the question.
  • Tap your answer.
3/10 = ?
7/10 = ?
2 4/10 = ?
9/10 = ?
WRITE THE FRACTION
  • Read the question.
  • Tap your answer.
0.6 = ?/10
0.1 = ?/10
0.8 = ?/10
0.5 = ?/10
READ THE PICTURE
  • Read the question.
  • Tap your answer.
A bar cut into ten equal parts, six shadedWhat decimal is shaded?
A number line from 0.0 to 1.0, with a dot at 0.8What decimal is at the dot?
A number line from 1.0 to 2.0, with a dot at 1.4What decimal is at the dot?
A bar cut into ten equal parts, two shadedWhat decimal is shaded?
COUNT BY TENTHS
  • Count up by one tenth at a time.
  • Tap the decimals from least to greatest.
11st
22nd
33rd
44th
55th
SentenceTrue or false?
0.4 = 4/10?
0.5 = 5/100?
1 2/10 = 1.2?
0.9 = 9/10?
Ten tenths make one whole.?
WHY THIS EXERCISE0.5 is 5 tenths, which is 5/10, not 5/100.
Try it
Line up 10 small things in a row, like spoons or blocks.
The whole row is 1. Each thing is 1/10, or 0.1, of the row.
Cover 4 of them with a cloth.
What decimal is covered? What decimal is not covered?
Draw a bar with 10 equal parts. Shade 0.7 of it.

Great work with tenths! Tomorrow Lizzy finds even smaller parts.