3 - Australian Teacher

Working outspacecontinue overpage if you needmore roomHow to Conquer Fractions, Decimals & Percentages Vol 2 MethodDecimalsMultiplication** The Rule: The number of digits following the decimal point in your answermust equal the combined number of digits following the decimal points in the twonumbers being multiplied.Method1. Ignore –just for now- the decimal points. Also ignore any zeroes at the start of a number. Nowmultiply the two numbers in the same way you would multiply any two whole numbers.2. Count the number of digits following the decimal point in each of the original numbers. Sum these.3. Insert a decimal point in the answer you obtained in step 1, ensuring the number of digits that followit equals the sum obtained in step 2.Example 1 Example 2 Example 31.2 x 0.8 25 x 1.25 1 000 x 0.341 2 1 2 5 1 0 0 0x 8 x 2 5 x 3 49 6 6 2 5 4 0 0 02 5 0 0 3 0 0 0 03 1 2 5 3 4 0 0 0= 0 . 9 6 = 3 1 . 2 5 = 3 4 0Example 4 Example 5 Example 60.25 x 2.56 12.35 x 0.08 23.66 x 1.352 5 6 1 2 3 5 2 3 6 6x 2 5 x 8 x 1 3 51 2 8 0 9 8 8 0 1 1 8 3 05 1 2 0 7 0 9 8 06 4 0 0 2 3 6 6 0 03 1 9 4 1 0= 0 . 6 4 = 0 . 9 8 8 = 3 1 . 9 4 1Now try these:1 7.5 x 0.6 2 9.4 x 0.3 3 0.8 x 8.3 4 0.3 x 5.75 34 x 2.85 6 27 x 3.64 7 5.3 x 45 8 9.9 x 519 2 000 x 0.49 10 3 000 x 0.28 11 0.24 x 4000 12 0.33 x 6 00013 0.45 x 4.2 14 6.5 x 9.2 15 56.8 x 0.5 16 8.5 x 8.217 4.52 x 0.05 18 56.5 x 0.02 19 0.01 x 789.8 20 0.72 x 77.521 54.2 x 2.5 22 63.5 x 7.2 23 4.2 x 0.85 24 9.08 x 0.225 6.5 x 9.2No. Correct % Score Signature or Comment© Intelligent Australia Productions 23