Adding Decimals (positive)

Open Ended

What are the names of each place value before and after the decimal point? Please write the place value above each number.

Multiple Choice

Which of the following is the correct place value for the digit 9 in the number 4567.8901?

• Hundredths

• Tenths

• Thousandths

• Ones

Multiple Choice

Based on the place value chart, what is the value of the digit 3 in the number 7345.023?

• 300

• 0.03

• 3,000

• 0.003

Multiple Choice

Which of the following addition or subtraction problems is solved incorrectly?

• 5,634 + 210 = 5,844

• 1234 + 1 = 1334

• 345 - 2 = 343

• 1,345 - 2 = 1,325

Open Ended

Based on the examples we just looked at, what do you think we need to do to make sure we are adding/subtracting decimals correctly?

Open Ended

Write the number 43.681 in word form.

Multiple Choice

Which of the following statements best explains why the problem 1234 + 1 = 1334 is incorrect?

• The numbers were not lined up by place value.

• The addition was done from left to right.

• The decimal points were not lined up.

• The answer is correct.

Multiple Choice

Which of the following is the correct standard form for 'Six thousand twenty-nine and forty-four thousandths'?

• 6029.044

• 6029.44

• 6029.0044

• 6029.00044

Multiple Choice

When adding decimals, what is the most important step to ensure accuracy?

• Line up the decimal points

• Add from left to right

• Ignore the decimal points

• Estimate the answer first

Multiple Choice

What is the sum of 31.45 and 6.2 when the decimals are lined up correctly?

• 37.65

• 37.45

• 37.55

• 36.65

Open Ended

Explain why it is important to line up the decimal points when adding numbers with decimals.

Multiple Choice

When adding decimals, what is the most important step to ensure the numbers are added correctly?

• Line up the decimal points

• Add the numbers from left to right

• Ignore the decimal points

• Start with the largest number

Multiple Choice

What is the sum of 345.987 and 27.4?

• 373.387

• 373.397

• 373.287

• 372.387

Open Ended

After learning about adding decimals, what questions do you still have or what would you like to know more about?

Open Ended

What is one important step you learned about adding decimals that helps you avoid mistakes?

Multiple Select

Which of the following are correct steps when adding 695.93 and 42.38 using a place value grid?

• Align the decimal points

• Add digits from right to left

• Ignore the decimal points

• Fill empty places with zeros

Open Ended

Why is it important to line up the decimal points when adding or subtracting decimals?

Multiple Choice

What is the sum of 1,238.4 and 22.15 when you line up the place values correctly?

• 1,260.55

• 1,216.25

• 1,260.25

• 1,216.55

Multiple Select

Select all the correct steps to add 23.8 and 5.

• Line up the decimal points

• Add the numbers as whole numbers

• Write the decimal point in the answer directly below the other decimal points

• Ignore the decimal point and add normally

Multiple Choice

Which of the following is the correct sum of 12.34 and 1.456?

• 13.796

• 13.800

• 13.790

• 13.900

Open Ended

Explain how you would add 73.8 and 569, and why lining up the decimal point is important in this calculation.