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Multiplying decimals

Directions for multiplying:

  1. Pretend the decimals do not exist and multiply the two numbers
  2. Count the total number of decimal places in the problem
  3. Place the decimal in the answer such that the answer has the same number of decimal places as the problem

Example 1: (3.48)(2.6) =

Example 2: 46.2 x 0.45 =

 

 Multiplying with the LATTICE method

 

 

Example 3: 3.14 x 7.6 =

  • Begin by counting the number of decimal places in the problem. There are three decimal places: 1, 4, and 6.
  • Now multiply the numbers as if they were whole numbers, while ignoring the decimals.

 

Example 4: 57.1 x 6.4 =
Multiplying the typical way

 

 

Self-Check

Q1: $\,\,\,\,\,5.2\times~3.7\,\,\,\,\,$ [show answer]

Q2: $\,\,\,\,\,1.73\times~2.1\,\,\,\,\,$ [show answer]

Q3: $\,\,\,\,\,6.28\times~0.51\,\,\,\,\,$ [show answer]

 

 

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