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What is 423 divided by 5?
84.6
What is 3 fifths of 70?
3/5 of 70 = 70*3/5 = 423/5 of 70 = 70*3/5 = 423/5 of 70 = 70*3/5 = 423/5 of 70 = 70*3/5 = 42
How do you estimate the product of 3.14 and 5.125 by rounding each number to the nearest whole number before multiplying?
3 x 5 = 15
How should you round off 4.45?
When rounding off 4.45, you look at the digit immediately to the right of the rounding position, which is 5 in this case. Since 5 is equal to or greater than 5, you round up the rounding position by adding 1 to it. Therefore, rounding off 4.45 to the nearest whole number would result in 5.
What are the rules to Estimating products and quotients of mixed numbers?
Estimating sumsUse rounded numbers to estimate sums.Example 1Give an estimate for the sum of 19.61 and 5.07 by rounding to the nearest tenth.Round each number to the nearest tenth.Example 2Estimate the sum of 19.61 + 5.07 by rounding to the nearest whole number.Round each number to a whole number.Estimating differencesUse rounded numbers to estimate differences.Example 3Give an estimate for the difference of 12.356 - 5.281 by rounding to the nearest whole number.Round each number to the nearest whole number.Now subtract.So 12.356 - 5.281 ≈ 7.Estimating productsUse rounded numbers to estimate products.Example 4Estimate the product of 4.7 × 5.9 by rounding to the nearest whole number.Round each number to a whole number.So 4.7 × 5.9 ≈ 30.Again, in decimals, as in whole numbers, if both multipliers end in .5, or are halfway numbers, rounding one number up and one number down will give you a better estimate of the product.Example 5Estimate the product of 7.5 × 8.5 by rounding to the nearest whole number.You can also round the first number down and the second number up and get this estimate.In either case, your approximation will be closer than it would be if you rounded both numbers up, which is the standard rule.Estimating quotientsUse rounded numbers to estimate quotients.Example 6Estimate the quotient of 27.49 ÷ 3.12 by rounding to the nearest whole number.Round each number to the nearest whole number.
