#### • Class 11 Physics Demo

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#### • steps on how to divide decimals

Question:how do you work out 100 divided 7 WITHOUT a calculator???

Answers:14.29 that is to 2 decimal places, if you want to keep going you will fill the page!

Question:I am going to be taking these tests at school and we cant have a calculator. I am not good at doing addition, subtracting, adding, and multiplying in my head. Do you know any shortcuts on how to make it easier?

Answers:Yes, there are short cuts, but you need to do a lot of practice. e.g. multiply by 10 = add a zero or shift the decimal point multiplying by 5 = multiply by 10 and halve add 9 = add 10, subtract 1 there are dozens of tricks, but they don't help if you don't practice them.

Question:I'm bad at maths and I'm doing an exam which I have to divide a 4 digit number by 8 eg: 4800 / 8 = do you have any tips on how I can do this in my head?

Answers:Divide by 2, then divide again, then again. 4800 2400 1200 600

Question:17.85 + 7 3/4 + 6 1/2 i know the answer. i'd like some one to explain how i'd do the work. i'm guessing i convert both mixed numbers into improper fractions. but i dont get how to add them with the decimal. its been a while since i've done a problem like this. i'm rusty, thats all. please help me be "not rusty".

Answers:You convert the fractional side of the mixed number into a decimal dividing the numerator by the denominator, so in 7 3/4 , 3 divided by 4 = 7.75 and 6 1/2 = 6.5 . Then add the three decimals. 17.85+7.75+6.5= 31.10 I hope I made myself clear.