Operations with Decimal Fractions - Multiplication

The video tutorial explains how to calculate the total length of ribbons and laces using multiplication of decimal numbers by whole numbers. It demonstrates the process step-by-step, including placing the decimal point correctly in the product. The first example involves calculating the total length of ribbons from six rolls, each 12.25 meters long. The second example calculates the total length of lace needed to decorate 24 boxes, with each box requiring 18.4 centimeters of lace. The tutorial emphasizes understanding decimal multiplication and proper placement of decimal points in the final product.

What is the first step in multiplying a decimal number by a whole number?

• Divide the decimal number by the whole number

• Subtract the smaller number from the larger number

• Multiply the numbers as if they were whole numbers

• Add the numbers together

How many digits are there after the decimal point in the number 12.25?

• One

• Three

• Four

• Two

When multiplying 18.4 by 24, what is the first step?

• Subtract 4 from 18.4

• Add 18.4 to 24

• Multiply 18.4 by 24 directly

• Multiply 18.4 by 4

How many digits should you count from the right in the product of 18.4 and 24 to place the decimal point?

• Two

• Three

• One

• Zero

What is the total length of lace required to decorate 24 boxes?

• 441.6 meters

• 73.50 meters

• 73.50 centimeters

• 441.6 centimeters