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Signs given new meanings (or swapped): which equation is correct

This type of question, asked 11 times: 14 Sep 2025 S2, 15 Sep 2025 S2, 16 Sep 2025 S1, 16 Sep 2025 S2, 16 Sep 2025 S3, 17 Sep 2025 S2, 18 Sep 2025 S2, 19 Sep 2025 S3, 20 Sep 2025 S1, 21 Sep 2025 S1, 22 Sep 2025 S1. All 11 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    14 Sep 2025 S2

    3
    If '÷\div' means '+', '-' means '×\times', '+' means '-' and, '×\times' means '÷\div', then which of the following equations is CORRECT?

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  2. Question 2

    15 Sep 2025 S2

    24
    If ‘×\times’ means ‘-’, ‘-’ means ‘+’, ‘/’ means ‘×\times’, and ‘+’ means ‘÷\div’, which equation is correct?

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  3. Question 3

    16 Sep 2025 S1

    22
    If '×\times' = '+', '+' = '-', '-' = '÷\div', '÷\div' = '×\times', which equation is correct?

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  4. Question 4

    16 Sep 2025 S2

    24
    If '×\times' = '−-', '−-' = '++', '++' = '÷\div', '÷\div' = '×\times', which equation is correct?

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  5. Question 5

    16 Sep 2025 S3

    22
    If ‘×\times’ = ‘−-’, ‘++’ = ‘÷\div’, ‘−-’ = ‘++’, ‘÷\div’ = ‘×\times’, then which is valid?

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  6. Question 6

    17 Sep 2025 S2

    23
    If 'P' = ×\times, 'Q' = ÷\div, 'R' = +, 'S' = −-, which equation is correct?

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  7. Question 7

    18 Sep 2025 S2

    9
    By interchanging the given two signs which of the following equation will be NOT correct? ++ and −- I. 18÷3+8×5−4=2018 \div 3 + 8 \times 5 - 4 = 20 II. 6+8×9÷3−4=146 + 8 \times 9 \div 3 - 4 = 14

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  8. Question 8

    19 Sep 2025 S3

    22
    If '×\times' = '−-', '−-' = '++', '/' = '×\times', '++' = '÷\div', which equation is correct?

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  9. Question 9

    20 Sep 2025 S1

    3
    If '÷\div' means '+, '×\times' means '-', '+' means ' ÷\div ' and '-' means '×\times', which of the following options is CORRECT?

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  10. Question 10

    21 Sep 2025 S1

    22
    If ‘×\times’ = ‘+’, ‘+’ = ‘−-’, ‘−-’ = ‘×\times’, and ‘/’ = ‘÷\div’, then which equation is correct?

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  11. Question 11

    22 Sep 2025 S1

    18
    If the signs are interchanged as follows: - '+' means '×\times' - '−-' means '÷\div' - '×\times' means '+' - '÷\div' means '−-' Choose the correct equation from the options below.

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