Writing in math, how can estimating help you add two-digit numbers?

If you estimate the sum, you have a general idea of your answer. If your actual answer isn't close to the estimate, you know you need to add the numbers again.

Estimating is also useful when you need an approximate answer and it's not convenient to use a calculator or pencil and paper to get the exact answer.

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Estimating can be a helpful strategy when adding two-digit numbers because it allows you to quickly approximate the sum without performing the exact calculation. Here's how you can use estimation to add two-digit numbers:

1. Start by looking at the two numbers you want to add. For example, let's say you want to add 46 and 58.

2. Round each number to the nearest ten. In this case, 46 rounds to 50, and 58 rounds to 60.

3. Add the rounded numbers. In this case, 50 + 60 equals 110.

4. The estimated sum is 110. This means that the exact sum of 46 and 58 should be close to 110.

By estimating, you can quickly determine that the sum of 46 and 58 is likely to be around 110. If you need a more precise result, you can then perform the exact calculation to find the exact sum. Estimation can help you get a ballpark idea of the answer before diving into the detailed arithmetic.