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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.
What is 17.26 to the nearest whole number?
When rounding 17.26 to the nearest whole number, you look at the first decimal place, which is 2. Since 2 is less than 5, you round down. Therefore, 17.26 rounded to the nearest whole number is 17.
Rounding off to the first digit is called?
Rounding to the first digit is simply called rounding. This will make the number equal to the same as what the number truly is.
When rounding to the nearest whole number why do 5.43 an 4.68 both round to 5?
It's the nature of rounding. When rounding to the nearest whole number, look at the tenths place. If that digit is 4 or less (like the first number) zero it and everything to the right of it out. If that digit is 5 or higher, (like the second number) increase the target digit by one and zero everything to the right of it out. 5.43 is closer to 5 than to 6. 4.68 is closer to 5 than to 4.
What is 7.6 to the nearest whole number?
When rounding 7.6 to the nearest whole number, you look at the first decimal place, which is 6. Since 6 is greater than or equal to 5, you would round 7.6 up to the next whole number, which is 8.
