A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 5 years ago
what is a fast way to multiply decimals, eg: 25 x 0.5, 17 x 0.75. also
what is a fast way to multiply 2 digit numbers eg: 90 x 91, 32 x 31.
thx, and ofcourse without using calculators i mean
anonymous
 5 years ago
what is a fast way to multiply decimals, eg: 25 x 0.5, 17 x 0.75. also what is a fast way to multiply 2 digit numbers eg: 90 x 91, 32 x 31. thx, and ofcourse without using calculators i mean

This Question is Closed

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Well, I write down 90 x91 and then multiply 1x0 then 1x9. After that I multiple 9x0 and then 9x9. Add the two answers!! :DD There you go 8190

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0For the decimal one. Think your adding coins. .25.+.50! It's .75! :3

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0If you have simple decimals with only 2 decimal places e.g. 0.75 you can just mulitply by 75 and then divide by 100 at the end by just shifting the decimal point 2 places to the left.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0If it's something hard like, .0192*.473 It's pretty simple. the same as multiplying! .0192 x.274 _______ 8 36 4 0 14 63 7 0 4 18 2 0 ______ add all of that up! .0052608 how do you know where to put the decimals? add each number to right of the decimal! .0192=4 .274=3 _________ 8 numbers to the left. If you don't have eight numbers you add zeros until you right 8! :DD Yay!
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.