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SingaporeMathsQuick questions

Number and Algebra

Quick questions on Numbers and the four operations explained: O-Level E-Maths

6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What are fractions?
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To add or subtract fractions, rewrite them over a common denominator, then combine the numerators:
What are decimals?
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Treat decimals as ordinary numbers, lining up the decimal point for addition and subtraction. For multiplication, multiply as whole numbers then count the total decimal places. For division, shift both numbers so the divisor is a whole number, 4.5÷0.5=45÷5=94.5 \div 0.5 = 45 \div 5 = 9.
What are order of operations?
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Work in the order: brackets, then indices (powers and roots), then multiplication and division left to right, then addition and subtraction left to right. The common memory aid is BIDMAS. So 3+4×22=3+4×4=3+16=193 + 4 \times 2^2 = 3 + 4 \times 4 = 3 + 16 = 19, not 4949.
What is q1?
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Evaluate −8+3×(−2)-8 + 3 \times (-2). [2 marks]
What is q2?
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Write 0.0306070.030607 correct to 3 significant figures. [1 mark]
What is q3?
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Evaluate 78×421\dfrac{7}{8} \times \dfrac{4}{21}, giving your answer as a fraction in its simplest form. [2 marks]

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