Explain how you can use benchmarks to estimate each sum?

Answer 1

Benchmarks can be used to estimate sums by rounding the numbers to the nearest easy-to-work-with values, such as whole numbers or multiples of ten. This simplifies the addition process and allows for a quick mental calculation. For example, if estimating the sum of 47 and 36, rounding 47 to 50 and 36 to 40 makes it easier to quickly estimate the sum as 90. This method provides a close approximation, helping to assess the reasonableness of the actual sum.