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Simplify an integer expression with nested brackets by BODMAS

This type of question, asked 4 times: 2 Mar 2023 Tier II, 3 Mar 2023 Tier II, 6 Mar 2023 Tier II, 18 Jan 2025 Tier II. All 4 questions below, oldest first.

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  1. Question 1

    2 Mar 2023 Tier II

    13
    Find the value of given expression. 30−[40−{56−(25−13−12)}]30 - [40 - \{56 - (25 - 13 - 12)\}]

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  2. Question 2

    3 Mar 2023 Tier II

    21
    Find the value of given expression. [76 – {90 ÷\div 5 ×\times (24 – 36 ÷\div 3) ÷\div 3}]

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  3. Question 3

    6 Mar 2023 Tier II

    14
    Find the value of given expression. 3−(−6){−2−9−3}÷7{1+(−2)(−1)}3 - (-6)\{-2 - 9 - 3\} \div 7\{1 + (-2)(-1)\}

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  4. Question 4

    18 Jan 2025 Tier II

    15
    The value of 43−02+(222)2−8+7×6=4^3 - 0^2 + \left(\frac{22}{2}\right)^2 - 8 + 7 \times 6 = ________

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