Not really.
If you are competent in using the basic operations of arithmetic (+ - * /) and follow the riles as these apply to decimal numbers then the decimal point will be correctly placed and finding a whole number estimate will only mean additional calculations which serve no purpose. On the other hand, if you are not that competent then how can you be sure that the whole number estimate that you find is accurate?
whenever you multiply a whole number by a decimal you get a decimal. 2.9x100=290
Yes.
multiply the decimal by 100
0.9 in thousandths place = 0.900
You multiply by 0.01 = 1/100.
When you multiply decimals, the decimal point is placed in the product.
Correct
To express the product of 2.94 and 24.8 correct to one decimal place, you would multiply the numbers and then round the result to one decimal place: 2.94 * 24.8 = 72.912 Rounding this to one decimal place, we get: ≈ 72.9
19.89
To estimate, you round the number to the nearest 10 and add, subtract, divide, or multiply. If the number is a decimal (ex. 12.132), you would round it to 12, and then round that to 10.
whenever you multiply a whole number by a decimal you get a decimal. 2.9x100=290
Yes.
line up the numbers and decimals multiply regularly then bring the decimal down
390% To change a decimal into a percentage, multiply the decimal by a hundred (or move the decimal point 2 places to the right) and add the percentage sign %. 3.9 × 100 =390.00% So the first answer above is also correct.
multiply the decimal by 100
One way is to multiply the numbers ignoring the decimal point. If the first multiplicand has d1 digits after the decimal point, and the second has d2 digits after the decimal point, then their product has (d1 + d2) digits after the decimal point.An alternative for the second stage is to estimate the answer to determine where the decimal point should go.
Change the decimal into a fraction or the easier way is to turn the fration into a decimal, then multiply.