Placing the Decimal Point in Multiplication

Miss Li continues teaching decimal multiplication, focusing on placing decimal points in products. She explains that the number of decimal places in the product is the sum of the decimal places in the factors. The video includes examples and exercises for students to practice. Miss Li also covers multiplying decimals by treating them as whole numbers and discusses rounding decimals, especially in the context of money. The lesson concludes with word problems involving money calculations.

What is the rule for placing the decimal point in the product of two decimal numbers?

• The number of decimal places in the product is the maximum of the decimal places in the factors.

• The number of decimal places in the product is the sum of the decimal places in the factors.

• The number of decimal places in the product is the difference of the decimal places in the factors.

• The number of decimal places in the product is the average of the decimal places in the factors.

In the example 1.4 × 2.56, how many decimal places should the product have?

• 4

• 1

• 2

• 3

Where should the decimal point be placed in the product of 0.6 × 0.5?

• Between the second and third digits

• After the last digit

• Between the first and second digits

• Before the first digit

If you multiply 0.02 by 0.003, how many decimal places should the product have?

• 3

• 4

• 2

• 1

When multiplying decimal factors, what should you do after treating them as whole numbers?

• Place the decimal point in the product

• Ignore the decimal places

• Subtract the decimal places from the product

• Add the decimal places to the product

How do you round a number to the nearest hundredths place?

• Look at the digit in the tenths place

• Look at the digit in the hundredths place

• Look at the digit in the thousandths place

• Look at the digit in the ten-thousandths place

If the digit behind the hundredths place is 8, what should you do?

• Keep the same

• Round up

• Round down

• Ignore it

Jordan makes $7.65 per hour and worked 7.5 hours. How much did she earn?

• $57.32

• $57.35

• $57.38

• $57.30

Mary buys 2.3 pounds of oranges at $0.79 per pound. How much will she pay?

• $1.85

• $1.78

• $1.80

• $1.82

What is the first step in solving a word problem involving decimal multiplication?

• Round the numbers

• Place the decimal point

• Write the expression

• Multiply the numbers