How do I multiply decimal numbers?

Start by multiplying the two numbers as though they didn't have a decimal point (e.g. 2.73.6 becomes 2736 = 972). Now add up how many decimal places were in the original two numbers (e.g. 2.7 and 3.6 have 2 decimal places, 3.45 and 9.2 have 3 decimal places) and give your answer that number of decimal places (e.g. since 2.7 and 3.6 have 2 decimal places, 2.73.6 will have 2 decimal places. Calculate 2736 = 972, then give it 2 decimal places to get 2.7*3.6 = 9.72).

Remember that, in this situation, zeroes should be counted as decimal places. For example: 1.024.05. Calculate 102405 = 41,310. Now notice that 1.02 and 4.05 have 4 decimal places. Therefore, give 41,310 4 decimal places to find that 1.02*4.05 = 4.1310.

Step by step this is layed out as:

1) Multiply without decimal points.

2) Count the number of decimal places in the 2 numbers you're multiplying.

3) Give your answer to part (1) the number of decimal places from part (2).

SG
Answered by Seb G. Maths tutor

3902 Views

See similar Maths 11 Plus tutors

Related Maths 11 Plus answers

All answers ▸

The average age of a group of 6 people is 21. One more person joins the group and the average is now 25. How old is the new member of the group?


Can I have some guidance on the correct answer for this word order, grammar question?


Mary keeps some animals on her farm.She has 12 sheep,16 cows,24 chickens and 6 pigs. Mary sells 8 of her sheep.What percentage of her remaining animals are sheep?


What is 2/5 + 3/4 ?


We're here to help

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

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences