PSLE Decimals — practice questions — page 2

Explore 37 free Decimals questions in PSLE Mathematics. Open each question or exercise to read its content, reference answers and available explanation.

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Decimals questions and exercises with answers

Showing questions 31–37 of 37.

A circle has a radius of 42.5 centimeters. Using pi as approximately 3.14, what is its area?Read the answer and worked solution →Ring up the right amountRead the answer and worked solution →Stop on the right place valueRead the answer and worked solution →Work the decimal placesRead the answer and worked solution →Sort the decimal place valuesRead the answer and worked solution →True or false: decimalsRead the answer and worked solution →Complete the decimal rulesRead the answer and worked solution →

Worked practice questions

A circle has a radius of 42.5 centimeters. Using pi as approximately 3.14, what is its area?

266.9 sq cm
1,806.25 sq cm
5,761.625 sq cm
5,671.625 sq cm

Show answer and solution

Correct answer: D. 5,671.625 sq cm

1. The formula for area is pi times the radius squared. 2. Square the radius first: 42.5 x 42.5 = 1,806.25. 3. Multiply by pi: 3.14 x 1,806.25. 4. This gives 5,671.625. 5. So the area is approximately 5,671.625 square centimeters. 6. 266.9 sq cm is actually the circumference of this same circle, not its area, and 1,806.25 sq cm forgets to multiply by pi at all. _Source: OpenStax Prealgebra (CC BY 4.0), Ch 5 "Decimals", section 5.3 Decimals and Fractions_

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Ring up the right amount

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Questions

Answer
15
Question
Noriko buys 4 coffees at $3.75 each. Total cost in dollars?
Answer
390
Question
Four friends split a $15.60 pizza bill equally. Each pays how many cents?
Answer
12.75
Question
Alan worked 30 hours and earned $382.50. His hourly rate in dollars?

Instructions

Work each money problem out, then type the number on the pad.

_Source: OpenStax Prealgebra (CC BY 4.0), Ch 5 "Decimals", section 5.2 Decimal Operations_

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Stop on the right place value

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Questions

Answer
Tenths
Question
First place right of the point.
Answer
Hundredths
Question
Second place right of the point.
Answer
Thousandths
Question
Third place right of the point.
Answer
Hundredths
Question
Where cents sit in a price.
Answer
Thousandths
Question
How US gasoline is priced.

Choices

Tenths
Hundredths
Thousandths
Ten-thousandths

Instructions

Tap once to start the sweep, then tap again to stop on the right place.

_Source: OpenStax Prealgebra 2e (CC BY 4.0), Ch 5 'Decimals', sections 5.1-5.7_