1

Mangoes are to be exactly divided into groups of 20, 30 or 36 .What is the minimum number of mangoes required?

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2

Find the Greatest Common Factor (GCF) of 18, 24 and 60. 1(a) GCF of 18, 24 and 60

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3

Express the numbers 1470 and 7056 each as a product of its prime factors.

Hence evaluate and simplify

image

if m = 1470 and n = 7056.

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4

Express 0.00152 correct to:

(i) two (2) significant figures

(ii)three (3) decimal places

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5

Write each of the numbers 18, 24 and 36 as a product of prime factors and hence find their greatest common factor.

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6

( Three airplanes arrived at Kilimanjaro International Airport (KIA) at the intervals of 30 minutes, 40 minutes and 55 minutes. If all three airplanes arrived at KIA at 2:00 p.m. on Saturday, when and at what time would they arrive together again?

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7

 Find the GCF of 210, 357 and 252.

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8

From the set of numbers {1, 3, 4, 5, 6, 8, 10, 15, 17, 21, 27}; write down:

(i) the prime numbers, (ii) the multiples of 3, (iii) the factors of 60.

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9

Four wooden rods with lengths of 70 cm, 119 cm, 84 cm and 105 cm are cut into pieces of the same length. Find the greatest possible length for these pieces if no wood is left over.

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10

Calculate the sum of the prime numbers between 70 and 90.

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11

Find the product of the G.C.F and L.C.M of 4, 8 and 12. 

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12

Calculate the value of , x + y + 2z ? 12 when x = 5 , y = 8 and z = 9 .

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13

Find the LCM and GCF of 13, 52 and 104.

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14

A block is cut into equal units of l0g, 20g and 35g. Use prime factorization method to find the smallest possible mass of the block form which the pieces can be cut.

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