Decimals
Hong Kong
Stage 2
Add double digit numbers with decimal values in hundredths
Lesson
Now that you've had some practice adding decimals, you can try adding decimals of larger quantities. Follow the same steps as before. You can use estimation to see if your answer makes sense!
Watch the steps in the video below. At the end, see how to estimate quickly to check your answer.
Front-End Estimation
Round by removing the numbers after the decimal point. Add your two numbers. Is the sum close to the sum of the decimals? If not, try your decimal sum again!
Examples:
Question 1
Find $33.42+37.33$33.42+37.33 giving your answer as a decimal.
Question 2
Find $24.56+36.44$24.56+36.44 giving your answer as a decimal.
question 3
Find $72.36+1.64$72.36+1.64 giving your answer as a decimal.