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Step 2 – Add the round number Example 1 1 8 4 + 9 7 9 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 1 1 8 4 + 9 7 9 = 2 1 6 3 © LazyMaths.com 9 7 9 + 1 1 8 4 1 0 0 0 2 1 - 1 1 8 4 + 2 1 - 2 1 8 4 2 1 6 3

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