Decimals: Addition, Subtraction, Multiplication, and Division

This video tutorial covers operations with decimals, including addition, subtraction, multiplication, and division. It explains the core ideas for each operation, such as lining up numbers by place value for addition and subtraction, counting decimal places for multiplication, and adjusting the divisor for division. The tutorial provides examples to illustrate these concepts and emphasizes the importance of aligning decimals correctly.

What is the key step to ensure accuracy when adding or subtracting decimals?

• Convert decimals to fractions

• Round the numbers to the nearest whole number

• Line up the numbers vertically by their place values

• Count the number of decimal places

When multiplying decimals, what should you do after counting the spaces after the decimal?

• Subtract the numbers normally

• Add the numbers normally

• Ignore the decimal and multiply the numbers

• Convert the decimals to fractions

What must be done to the divisor in a division problem involving decimals?

• Multiply it by 10

• Ensure it does not have a decimal

• Convert it to a fraction

• Round it to the nearest whole number

In the example 38.49 + 16.7, what is the correct way to align the numbers?

• Align the numbers to the left

• Align the numbers to the right

• Align the decimal points and add zeros where necessary

• Align the numbers by their whole number parts

What is the result of 38.49 - 16.7?

• 24.79

• 23.79

• 22.79

• 21.79

How many spaces are there after the decimal in the multiplication problem 202.3 x 1.05?

• 3

• 4

• 2

• 1

What is the final answer to the multiplication problem 202.3 x 1.05?

• 215.415

• 212.415

• 214.415

• 213.415

In the division problem 45.82 ÷ 2.9, what is the first step?

• Convert the divisor to a fraction

• Move the decimal point in the divisor to the right

• Round the divisor to the nearest whole number

• Multiply the divisor by 10

What is the result of 45.82 ÷ 2.9?

• 17.8

• 16.8

• 15.8

• 14.8

What is the final answer to the division problem 0.0506 ÷ 0.044?

• 1.15

• 1.10

• 1.20

• 1.05