JAMB Mathematics questions: Fractions, decimals, approximations and percentages

27 questions with answers and explanations. Tap an option to check yourself.

1. Question 1· Fractions, decimals, approximations and percentages· JAMB

   Express 7/20 as a decimal.

   • A0.35
   • B0.7
   • C0.035
   • D3.5

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   Explanation and discussion

2. Question 2· Fractions, decimals, approximations and percentages· JAMB

   A man spends 2/5 of his salary on rent and 1/4 of the remainder on food. What fraction of his salary is left?

   • A7/20
   • B9/20
   • C11/20
   • D3/20

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   Explanation and discussion

3. Question 3· Fractions, decimals, approximations and percentages· JAMB

   Simplify (2/3 + 1/4) ÷ 11/6.

   • A11/12
   • B2/3
   • C1/2
   • D3/4

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4. Question 4· Fractions, decimals, approximations and percentages· JAMB

   Evaluate 2½ − 1¾.

   • A¾
   • B1¼
   • C½
   • D1¾

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5. Question 5· Fractions, decimals, approximations and percentages· JAMB

   Evaluate (0.0024 × 0.15) ÷ 0.0012.

   • A30
   • B3
   • C0.03
   • D0.3

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6. Question 6· Fractions, decimals, approximations and percentages· JAMB

   A length of 5 cm is measured as 4.8 cm. Find the percentage error.

   • A4.2%
   • B2%
   • C0.2%
   • D4%

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7. Question 7· Fractions, decimals, approximations and percentages· JAMB

   Find the percentage error, to 2 decimal places, when 0.0396 is approximated as 0.04.

   • A1.01%
   • B1.00%
   • C0.40%
   • D4.04%

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8. Question 8· Fractions, decimals, approximations and percentages· JAMB

   Express 0.00456 in standard form.

   • A4.56 × 10^-2
   • B45.6 × 10^-4
   • C4.56 × 10^-3
   • D4.56 × 10^3

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9. Question 9· Fractions, decimals, approximations and percentages· JAMB

   A man saves 15% of his monthly salary of ₦80,000. How much does he save each month?

   • A₦68,000
   • B₦15,000
   • C₦1,200
   • D₦12,000

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10. Question 10· Fractions, decimals, approximations and percentages· JAMB

    Simplify (3/4 of 2⅔) ÷ 1⅓.

    • A2/3
    • B3/2
    • C2
    • D8/9

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11. Question 11· Fractions, decimals, approximations and percentages· JAMB

    Express 0.06724 correct to two significant figures.

    • A0.0672
    • B0.068
    • C0.07
    • D0.067

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12. Question 12· Fractions, decimals, approximations and percentages· JAMB

    Simplify 1¼ + 2⅓.

    • A3 2/7
    • B3 7/12
    • C3½
    • D4 1/12

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13. Question 13· Fractions, decimals, approximations and percentages· JAMB

    Find the compound interest on ₦10,000 at 10% per annum for 2 years.

    • A₦2,100
    • B₦2,000
    • C₦12,100
    • D₦1,100

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14. Question 14· Fractions, decimals, approximations and percentages· JAMB

    Express the recurring decimal 0.666… as a fraction.

    • A3/5
    • B2/3
    • C6/10
    • D5/6

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15. Question 15· Fractions, decimals, approximations and percentages· JAMB

    Find the simple interest on ₦20,000 at 5% per annum for 3 years.

    • A₦1,000
    • B₦3,000
    • C₦300
    • D₦6,000

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16. Question 16· Fractions, decimals, approximations and percentages· JAMB

    Share ₦4,500 between Ade and Bisi in the ratio 4 : 5. How much does Ade get?

    • A₦900
    • B₦2,500
    • C₦1,800
    • D₦2,000

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17. Question 17· Fractions, decimals, approximations and percentages· JAMB

    A man spends 1/4 of his salary on rent and 2/5 of the remainder on food. What fraction of his salary is left?

    • A7/20
    • B9/20
    • C11/20
    • D3/10

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18. Question 18· Fractions, decimals, approximations and percentages· JAMB

    Express 0.00467 correct to one significant figure.

    • A0.004
    • B0.005
    • C0.0047
    • D0.01

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19. Question 19· Fractions, decimals, approximations and percentages· JAMB

    A man sold a radio for ₦13,800 at a loss of 8%. Find the cost price.

    • A₦12,696
    • B₦14,904
    • C₦15,000
    • D₦12,000

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20. Question 20· Fractions, decimals, approximations and percentages· JAMB

    Find 2.5% of ₦8,000.

    • A₦320
    • B₦20
    • C₦2,000
    • D₦200

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    Explanation and discussion