We have been concentrating on maths for the past few days. We have been through:
Decimals
Adding, subtraction - the general rule is to proceed as normal or remove decimals and then reinsert the decimals at the end.
Multiplying - remove decimals, work out and then combine the number of decimals points in the answer.
Division - make a whole number by multiplying by 10 or 100 and then do long division. The answer will be the same as if you had not multiplied by 10 or 100.
make it a whole number
Factors
Factors of 10 are 2 x 5. Factors of 20 are 2 x 10 + 2 x 2 x 5 = 2squared x 5.
Prime numbers
Prime numbers only have 2 factors - 1 and themselves.
2,3,5,7,11,13,17 etc. 2 s the only even prime number. To work out if it is a prime number: is it divisable by 2,3,5,7? If not then its a prime number.
HCF
Take the lowest factors (all of them) and work out.
LCM
Take the higests common factors (all of them) and work out
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