What is a common factor?
A factor is a number that can be multiplied into another number with nothing left over. The factors of 9 are 1, 3, 9.A common factor is a number that is a factor of two different numbers. The factors of 9 are 1,3, 9 and the factors of 12 are 1, 2, 3, 4, 6, 12. The common factors are the numbers that appear in both lists. so here, the common factors are 1 and 3.
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Related Maths KS3 answers
All answers ▸Solve Simultaneous equations: 3x + 4y = 23 & 2x + 3y = 16
(x+3)(x+2)
Asha and Lucy sell pencils. Asha sold 7 boxes, and 22 singles. Lucy sold 5 boxes, and 2 singles. Given Asha sells twice as many pencils as Lucy, work out how many questions are in each box.
There are 12 counters in a bag. 1/2 are red, 1/3 of the remaining counters are blue. The rest are green. How many counters are green?