Mini Mathematics
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Count coins and notes

Count the value of Singapore coins and notes, keeping cents and dollars separate.

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  • Primary 1 Mathematics 2021
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Count the value, not just the pieces

A 10-cent coin and a 50-cent coin are both one coin. They do not have the same value. Read the value on each coin.

Three 10-cent coins have a value of 10 + 10 + 10 = 30 cents. One 20-cent coin and one 10-cent coin also make 30 cents. Different sets of coins can buy the same amount.

Make 100 cents

100 cents make 1 dollar. Two 50-cent coins make 100 cents. Five 20-cent coins make 100 cents too.

For a 50-cent coin, a 20-cent coin and two 10-cent coins, count 50, 70, 80, 90. The amount is 90 cents. You need 10 cents more to make 100 cents.

Check your understanding 1 A coin is missing

You have 65 cents. How many more cents make 100 cents?

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35 cents, because 65 + 35 = 100. One way is a 20-cent coin, a 10-cent coin and a 5-cent coin.

Count dollars separately

For two $10 notes, one $5 note and one $2 note, count $10, $20, $25, $27. The amount is $27.

The dollar sign tells you that these values are dollars. Do not add 20 cents to $10 as if they were the same unit.

Check your understanding 2 Same amount, different pieces

Ari has one $10 note. Bo has two $5 notes. Who has more money? Now Bo adds one $2 note. Who has more?

Show answer

At first both have $10, even though Bo has more notes. Then Bo has $12, which is $2 more than Ari. Compare values, not the number or size of the pieces.

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Check your understanding 3 Count each value the right number of times

One set has two 20-cent coins, one 5-cent coin and one 10-cent coin. How many cents is that?

A separate set has two $10 notes and three $2 notes. How many dollars is that? Keep the two answers separate.

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The first set has 55 cents: count 20, 40, 45, 55. The second has $26: count 10, 20, 22, 24, 26 dollars. There are four coins in the first set and five notes in the second; the number of pieces is not their total value.

Make 80 cents in two ways using coin values you know. Count each set to check it.

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One way is 50 cents, 20 cents and 10 cents. Another is four 20-cent coins. Both total 80 cents.

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