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20 Cards in this Set
- Front
- Back
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Write 4135 in S.F.
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4.135 x 10^3
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Write 0.00065 in S.F.
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6.5 x 10^-4
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Multiply 2.3 x 10^5 by 5 x 10^7
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1.15 x 10^13
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Divide 2.3 x 10^5 by 5 x 10^7
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4.6 x 10^-3
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What are prime numbers?
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A whole number greater than 1 that has exactly two factors, itself and 1.
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List the first ten prime numbers.
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2, 3, 5, 7, 11, 13, 17, 19, 23, 29.
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What are the three steps of the method for determining prime numbers?
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1) Find its square root
2) List all primes which are less than this square root 3) Divide the original number by all these primes under test (if any divide cleanly, it is not a prime number). |
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What are multiples?
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The multiples of a number are its times table (e.g. the multiples of 13 are 13, 26, 39, 52, 65...)
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What are factors?
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All the numbers that divide into it.
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Find all the factors of 24.
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1x24
2x12 3x8 4x6 5x- 6x4 Factors of 24 = 1, 2, 3, 4, 6, 8, 12, 24. |
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Find highest common factor of 60, 72, 84.
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60 = 2 x 2 x 3 x 5
72 = 2 x 2 x 2 x 3 x 3 84 = 2 x 2 x 3 x 7 Use the numbers that are common to all the numbers. H.C.F = 2 x 2 x 3 = 2^2 x 3 = 12 |
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Express 60 as a product of its prime factors. Give your answer in index form.
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2 ^2 x 3 x 5
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Find the least common multiple of 28, 30 and 45.
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28 = 2 x 2 x 7
30 = 2 x 3 x 5 45 = 3 x 3 x 5 L.C.M = 2 x 2 x 3 x 3 x 5 x 7 = 2^2 x 3^2 x 5 x 7 = 1260 |
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How do you check that a number divides by 3.
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Add numbers and see if total divides by 3.
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He buys 100m of TV cable. Each house needs 10m of cable. Length of cable he buys is correct to the nearest metre, length of cable needed for each house is correct to nearest half metre. After working at 9 houses what is minimum length of cable left?
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99.5 - 92.25 = 7.25m
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Which fractions are recurring?
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1/3 1/6 1/7 1/9
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Which fractions are non reccurring?
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1/2 1/4 1/5 1/8
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4/9 = 1/9 = 3/9 =
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.444444 .11111111 .3333333
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What is the L.C.M.
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The lowest number that they all divide into.
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What is the H.C.F.
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The largest number that will divide exactly into the numbers.
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