Multiplying a decimal by a decimal

Hannah C English 1 page

Content of the notes (1)

Example:

6.8 x 9.4 first make an estimate by rounding

eg. 7 x 9 = 63

68 x 94 = 6392 Then do the calculation without decimal points

6.8 x 9.4 = 63.92 Use the estimate to put the decimal pints back in the numbers

This method is difficult to use when both numbers are below zero - Use this method:

0.3 x 0.2 Count the number of digits after the decimal points eg. in this example there are 2

Then do the calculation as if there are no zeros

eg. 3 x 2= 6

Write the answer putting in the same number of digits after the decimal point, as you counted in the question eg. 0.06

0.3 x 0.2 = 0.06