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WorksheetsPrime factors, LCM, HCF
Total questions: 35
Worksheet time: 2hrs 37mins
(1 and itself)
7 14 22 28
Which one is incorrect?
Which answer lists all the factors for 40?
1,2,4,5,8,12,14,40
1,2,3,4,5,8,10
1,2,4,5,8,10,20,40
1,2,4,5,6,7,8,9,10
Find the LCM of 12 and 16...
48
36
64
96
Which of these numbers is not prime?
17
25
23
37
Name the 5th prime number.
2
11
5
7
Find the HCF for 18, 36, and 81
3
2
6
9
Sophie checks her bike for repairs every 9 days and Susan check hers every 12 days. If they both check their bikes today, after how many days do they next both check their bike again?
HCF
LCM
There are two loaf cakes. One is 35cm long and one is 21cm long. They want to cut the cake up and sell the slices, but all the slices must be equal. What is the largest slices that they can cut them into?
HCF
LCM
A carpenter got given some free wooden planks. Some are 12m long and some are 18m long. She wants to cut them up so that she has equal size planks to make using them easier. What size planks should she cut them into to avoid wasting any wood?
HCF
LCM
Tom and Claire both like do short exercise that involve small breaks. Tom does a short burst of exercise every 2 minutes, and Claire does hers every 3 minutes. If they start doing their exercise at 9:00am, when do they both do their exercises again?
HCF
LCM
Which shows the prime factorization of 84?
2×2×3×7
2×2×3×3×7
4×21
7×21
Four bells ring at intervals of 6, 7, 8 and 9 seconds respectively. After how many seconds do all the bells ring together?
504
508
512
516
Three bells toll together at intervals of 9, 12 and 15 minutes. If they start toiling together, after what time will they toll next?
1 hour
121hour 1
221hour
3 hour
The lowest common multiple of 8,16 and p is 48. What is the possible value of p?
2
24
32
64
Mary has 24 pastries and wants to share pastries with her 20 friends. The greatest number of pastries any friend can get
2
4
5
6
Melanie and Martin are both building a toy train track out of connecting pieces. Melanie has pieces that are 8 cm long while Martin's pieces are 20 cm long. How long will the shortest track be that they can each build with the same length?
2
4
20
40
write 140 as th product of its prime factors
2x2x5x7
2x2x2x2
3x2x3x5
7x9x5x2
A number is expressed as
23 x 33 x 5.
What is the number?
11
72
270
1080
How should you express 96 as a product of its prime factors?
32 x 3
3 x 25
2 x 48
1 x 25 x 3
What is 720 as a product of its prime factors?
24 x 32 x 5
16 x 33 x 5
23 x 42 x 3
26 x 7
Find the LCM of 120 and 150.
300
360
450
600
Find the HCF of 32 and 80.
8
16
24
32
What is the HCF of 72 and 120
22
24
26
28
What is the LCM of 72 and 108?
144
216
280
312
Ben exercises every 12 days and Isabel every 8 days. Ben and Isabel both exercised today. How many days will it be until they exercise together again?
4
6
12
24
Lamp A lights up every 15 minutes and lamp B lights up every 20 minutes. If at 09.00 the two lights turn on together, the second lamp will turn on together again for the second time at ...
09.30
09.45
10.00
10.30
Derek advises a patient to have a scale every 4 months and a polish every 6 months. If they have a scale and polish today, how long will they wait before they can have both during the same appointment?
HCF
LCM
What is a factor?
a number or quantity that when multiplied with another produces a given number or expression.
a number that can be divided by another number without a remainder.
A Number
A number experssiona to solve a multiplication problem
SHOW ANSWER
HCF of 8 and 11
11
88
8
1
