I think you round it to the nearest whole number...
Wiki User
∙ 2012-01-05 22:59:16In the same way as you estimate them for whole numbers.
To divide decimals the partial sums method requires that numbers are separated into individual portions. The separated numbers are then solved in long division until eliminated.
you have to add
The two different pairs of decimals whose sums are 14.1 and one pair involves regrouping on math are 8.4 and 5.7.
decimals must be estimates unless they have multiples of 2 or 5 in the mantissa 1.857142857 + 2.142857142 =3.9999999999 estimate 4.00000000 1 6/7 + 2 1/7 = 4 exact 1.1250000000 + 2.875 = 4.000 +- only 3 significant digits so best estimate possible 1 1/8 + 2 7/8 = 4 exact
to find a low estimate for the product of two decimals, round both factors
68
by estimating the number after the decimal
The basic idea is the same as when you estimate sums and differences of larger numbers (which may or may not be integers). You round the numbers to one or two decimal digits, then add them up.
Decimals are estimated by rounding off the decimal places to the nearest tenths,hundredths,thousandths,ten thousandths,etc.
1.0 and 0.5
7.8+31.39+6.95