How do I add decimal numbers?

Adding decimal numbers is done exactly the same as normal numbers: the column method.When you have 2 decimal numbers to add together the most important thing is to line up the decimal points (dots) so that they're all above each other. You should now have 2 numbers on top of each other to add together. If you have any gaps then quickly draw a 0 to fill it.After this, start on the right hand side of the column and add together the numbers which are on top of each other. If the answer is less than 10 then write it below the numbers you just added together. If the number is above 10 then write down the last number: for example if your answer is 15 then write down 5, if your answer is 47 then write down 7, and if your answer is 22 then write down 2. The tens carries over to the next column of numbers (the column to the left of the one you just added together).Keep doing this until you get to the far left of the column. If you've lined up the decimal point then you shouldnt have to worry about it whilst you do all the adding. Finally, add a decimal point into your answer exactly below the others in your column equation. 

Answered by Maddie S. Maths tutor

3324 Views

See similar Maths 11 Plus tutors

Related Maths 11 Plus answers

All answers ▸

If the base of an equilateral triangle is 3cm, and the height is 5cm, what is the area?


John left home at 13:55 and reached the shops at 15:20.  How long did his journey take?


3 eggs cost £4.80 and 4 slices of bread cost £3.00. What is the cost of 1 egg and 1 slice of bread?


The size of two of the three angles in a triangle are 40 degrees and 70 degrees. What is the special name given to this triangle?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo
Cookie Preferences