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Round these numbers to the nearest ten: a) 13 b) 42 c) 35 d) 54 e) 21 f) 79 g) 68 h) 97 i) 86

Mathematics

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Step-by-step solution

18 steps

Here are the numbers rounded off to the nearest ten:

Part a· 2 steps

  1. Identify the ones digit of 13, which is 3.

  2. Since 3<53 < 5, round down.

    13≈1013 \approx \boxed{10}

Part b· 2 steps

  1. Identify the ones digit of 42, which is 2.

  2. Since 2<52 < 5, round down.

    42≈4042 \approx \boxed{40}

Part c· 2 steps

  1. Identify the ones digit of 35, which is 5.

  2. Since 5≥55 \ge 5, round up.

    35≈4035 \approx \boxed{40}

Part d· 2 steps

  1. Identify the ones digit of 54, which is 4.

  2. Since 4<54 < 5, round down.

    54≈5054 \approx \boxed{50}

Part e· 2 steps

  1. Identify the ones digit of 21, which is 1.

  2. Since 1<51 < 5, round down.

    21≈2021 \approx \boxed{20}

Part f· 2 steps

  1. Identify the ones digit of 79, which is 9.

  2. Since 9≥59 \ge 5, round up.

    79≈8079 \approx \boxed{80}

Part g· 2 steps

  1. Identify the ones digit of 68, which is 8.

  2. Since 8≥58 \ge 5, round up.

    68≈7068 \approx \boxed{70}

Part h· 2 steps

  1. Identify the ones digit of 97, which is 7.

  2. Since 7≥57 \ge 5, round up.

    97≈10097 \approx \boxed{100}

Part h(i)· 2 steps

  1. Identify the ones digit of 86, which is 6.

  2. Since 6≥56 \ge 5, round up.

    86≈9086 \approx \boxed{90}
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