Mastering Multiplying Decimals

Miss Davis explains multiplying decimals, starting with a review of multiplying whole numbers and decimals. She demonstrates using both the standard algorithm and the box method. The video includes practical examples, such as calculating the cost of multiple items, and uses visual models to illustrate multiplying decimals. The lesson concludes with a focus on the standard algorithm for decimal multiplication.

What method does Miss Davis prefer for solving multiplication problems?

• Using a calculator

• Mental math

• Standard algorithm

• Box method

Tags

CCSS.4.NBT.B.5

How many times did Miss Davis move the decimal point to make $2.68 a whole number?

• Three times

• One time

• Did not move

• Two times

Tags

CCSS.5.NBT.A.2

What is the total cost of 6 bags of chips if one bag costs $2.68?

• $16.08

• $16.80

• $160.80

• $1.68

Tags

CCSS.6.NS.B.3

In the model of 6 tenths times 8 tenths, what color represents the overlapping area?

• Red

• Blue

• Purple

• Orange

Tags

CCSS.5.NF.B.4B

How many boxes were shaded in both blue and red in the model?

• 100

• 68

• 48

• 86

Tags

CCSS.2.NBT.B.7

What does each box in the hundreds grid represent?

• Thousandths

• Tenths

• Hundredths

• Whole numbers

What is the result of multiplying 6 tenths by 8 tenths?

• 48

• 4.8

• 0.048

• 0.48

Tags

CCSS.5.NBT.B.7

How many times did Miss Davis move the decimal out when multiplying 4 tenths by 3 tenths?

• One time

• Did not move

• Two times

• Three times

Tags

CCSS.5.NBT.A.2

What is the final answer when multiplying 4 tenths by 3 tenths?

• 0.012

• 0.12

• 1.2

• 12

Tags

CCSS.6.NS.B.3

What is the purpose of moving the decimal back in after multiplication?

• To adjust for place value

• To convert to a whole number

• To make the number smaller

• No specific purpose

Tags

CCSS.5.NBT.B.7