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Step 2 – Add the round number Example 3 6 8 + 7 8 5 Addition using Subtraction Step 3 – Subtract the difference Step 1 – Select the number closest to a round Number and modify it as shown Final Answer 3 6 8 + 7 8 5 = 1 1 5 3 © LazyMaths.com 7 8 5 + 3 6 8 8 0 0 1 5 - 3 6 8 + 1 5 - 1 1 6 8 1 1 5 3

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