Idea 8of 23Builds onDecimals in expanded form
Decimals as money
How does money help you compare decimals?
Today you'll discover
- how coins show tenths and hundredths of a dollar
- why $2.50 is more than $2.05
- how to write coins as a decimal
Think first$2.50 and $2.05
Which is more money: $2.50 or $2.05?
Decide first, then press Next. Compare the dollars first, then the tenths.
A place-value chart with two rows, $2.50 and $2.05, with headings ones ($1), tenths (10¢) and hundredths (1¢). Coins appear beside each row: two loonies and two quarters, then two loonies and a nickel. The tenths column is shaded: 5 > 0. Then $4.25 as 4 loonies and 1 quarter. The last step compares $1.75 and $1.57.
See the whole ideathe big idea and the key word, in one place
The big idea
A dollar is one whole: dimes are tenths of it and cents are hundredths.
Coins as decimals
A loonie is $1.00. A quarter is $0.25. A dime is $0.10. A nickel is $0.05.
- Loonie$1.00
- Quarter$0.25
- Dime$0.10
- Nickel$0.05
Easy to get wrongPrices always show two places: $2.50, not $2.5. It is the same amount, written to the cent.
Key words
- loonie
- the Canadian one-dollar coin: $1.00
- quarter
- the coin worth 25 cents: $0.25, a quarter of a dollar
Ready to use it?
- Write a set of coins as a decimal amount.
- Compare two prices.