WORKSHEET: MULTIPLES AND FACTORS |
Worksheets | Descargar PDF | ||

1) List all the factors of: | ||||

a) 20 | b) 30 | c) 14 | ||

d) 17 | e) 32 | f) 54 | ||

Solution | ||||

2) Write down the first ten multiples of: | ||||

a) 3 | b) 6 | c) 15 | ||

d) 4 | e) 11 | f) 12 | ||

Solution | ||||

3) Factor into primes: | ||||

a) 50 | b) 800 | c) 120 | ||

d) 34 | e) 1440 | f) 175 | ||

Solution | ||||

4)Find a number which is a multiple of: | ||||

a) 5 and 8 | b) 20 and 3 | c) 12 and 7 | ||

d) 34 and 17 | e) 15 and 25 | f) 14 and 42 | ||

Solution | ||||

5)Find the HCF (Highest Common Factor) and the LCM (Lowest Common Multiple) of each pair of numbers: |
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a) 10 and 16 | b) 49 and 77 | c) 200 and 300 | ||

d) 450 and 600 | e) 72 and 270 | f) 22 and 121 | ||

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6) Find the smallest prime number greater than 1000. | ||||

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7) Find the Highest Common Factor of 1008, 1260, 882 and 1134. | ||||

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8) Two natural numbers are called relatively prime if they have no common factor greater than 1. Find two relatively prime natural numbers that are each greater than 1000. | ||||

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9) There are two lighthouses on the top of a hill. The first flashes once every 8 seconds, and the other flashes once every 12 seconds. If they flash at the same time, how long will it take until they flash simultaneously again? | ||||

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10) Find the smallest number such that aa x 338 is a square number. |
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Solution |