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Module 5: Multiplying Decimals The key to multiplying decimals is simply knowing your multiplication facts! Step 1: Multiply as if the factors were whole numbers Step 1: 8.5 x 2.5= 85 X25 425 1700 Step 2: Count the total decimals moves in EACH factors 8.5 x 2.5= 2 moves total Step 1: 8.5 X2.5 425 1700 2 1 2 5 next….. Step 3: Move the TOTAL deci moves in the product Step 1: 8.5 X2.5 425 1700 2 1 .2 5 Try These: 1) 4.8 x 0.5 2) 3.55 x .05 Answers: 1) 4.8 x 0.5 48 x5 = 2.40 2 moves in product 2) 3.55 x .05 355 x 5 = 0.1775 4 moves in product Lets practice write each problem vertically remember to move the total deci moves for each FACTOR in your PRODUCT 34.9 X 0.15 Basically it’s 349 x 15 Then deci in product 3 times 34.9 X 0.15 ANSWER 5.235 12.45 x 1.7 1245 x 17 = 21165 then move deci 3 times from the left in your product 21.165 12.45 x 1.7 Answer 21.165 0.45 x 1.90 Count the total deci moves. Just multiply 45x19 then move deci moves in the product 0.45 x 1.90 Answer: 0.855 3.05 x 1.65 Solve 305 x 165 Then move total deci moves in the product 3.05 x 1.65 Answer: 5.0325 Try These on your own: A) B) C) D) 3.7 x 0.45 98.3 x 1.7 4.5 x 0.84 89.5 x 4.9 Answers: A) B) C) D) 3.7 x 0.45= 1.665 98.3 x 1.7= 167.11 4.5 x 0.84= 3.78 89.5 x 4.9= 438.55