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🔢 Decimals & Percents

A friendly first look at decimals and percents, using money, pizza, and everyday life.

4
lessons
~15 min
to learn
🔢 Math
subject
Ages 6–12
level
Start the course →

What you’ll learn

  1. The Magic of the DotUnderstand the decimal point and the tenths and hundredths places, using money as the model.A decimal point splits a number into a whole part on the left and pieces on the right, like dollars and cents. The first place after the dot is the tenths (0.3 is three tenths) and the next is the hundredths (0.25). To compare decimals, look at the tenths first, which shows why 0.6 is bigger than 0.45.
  2. Decimals and Fractions Are FriendsConnect common fractions to their decimal forms, like 1/2 = 0.5 and 1/4 = 0.25.Decimals and fractions are two ways to write the same amount. One half is 0.5, one quarter is 0.25, and three quarters is 0.75. Any tenths decimal easily becomes a fraction over 10, and hundredths go over 100. Both decimals and fractions describe a piece of a whole.
  3. Percents Mean Out of 100Understand that a percent means 'out of 100' and connect percents to decimals and fractions.Percent means 'out of 100,' so 50% is 50 out of 100 and 100% is the whole thing. Pizza slices and test scores make this real: 90% means 90 out of 100 points. Percents, decimals, and fractions are all connected, so 50% equals 0.5 equals 1/2.
  4. Percent Tricks and Real LifePractice easy percents like 10%, 50%, and 25% and recognize decimals and percents in everyday life.For 10%, split a number into 10 groups and take one (10% of 50 is 5). For 50%, cut it in half; for 25%, take a quarter. These tricks help with real life, where prices use decimals and sale signs, sports times, game bars, and batteries all use decimals and percents.

Questions this course answers

In the price $3.50, what does the part to the LEFT of the dot show?

The left side of the decimal point shows the whole part, like whole dollars. The right side shows the pieces, like cents.

In the number 0.3, what does the 3 mean?

The first spot after the dot is the tenths place, so the 3 means three tenths, like eating 3 pieces of a bar split into 10.

Which is bigger, 0.6 or 0.45?

Compare the tenths first! 0.6 has 6 tenths and 0.45 has only 4 tenths, so 0.6 is bigger, just like 60 cents beats 45 cents.

The fraction 1/2 is the same as which decimal?

Half of something is 0.5, which means five tenths. If you split a pizza into 10 slices, half is 5 slices, and 5 out of 10 is 0.5.

One quarter, the fraction 1/4, is the same as which decimal?

One quarter is 0.25, the same as 25 cents. Four quarters make one whole dollar, just like four 0.25s make 1.

What does the word 'percent' mean?

Percent means 'out of 100.' So 50% means 50 out of 100, and 100% means all of it, the whole thing.

Grounded in trusted sources

  • National Council of Teachers of Mathematics
  • Khan Academy
  • PBS Kids

Every Wunder lesson is built from real, reputable sources — never invented.

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