Question

Three students in Ms. Cho’s class wrote the following problems on the board. The correct digits in the products are given, but the decimal point isn’t placed yet. Where should the decimal point go in each?

Answer 1

It's important to remember that the decimal point in a product is placed directly above the decimal point in the multiplicand (the number being multiplied by another number). In order to determine the correct placement of the decimal point in the product, you will need to consider the decimal point placement in the multiplicand and the multiplier.

For example, if you are multiplying 0.1 by 10, you would place the decimal point in the product directly above the decimal point in the multiplicand, which would give you a product of 1.0.

On the other hand, if you are multiplying 1 by 0.1, you would place the decimal point in the product directly above the decimal point in the multiplier, which would give you a product of 0.1.

Here are the solutions to the problems written on the board:

1) 5.6 × 2 = 11.2

0.8 × 5 = 4.0

0.7 × 9 = 6.3