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CanadaON
Grade 7

1.12 Greatest common factor and lowest common multiple

Interactive practice questions

Consider the following prime factorisations:

$224=2\times2\times2\times2\times2\times7$224=2×2×2×2×2×7
$196=2\times2\times7\times7$196=2×2×7×7

Find the greatest common factor of $224$224 and $196$196.

Easy
1min

Consider the following prime factorisations:

$90=2\times3\times3\times5$90=2×3×3×5
$1800=2\times2\times2\times3\times3\times5\times5$1800=2×2×2×3×3×5×5

Easy
1min

Consider the following prime factorisations:

$378=2\times3\times3\times3\times7$378=2×3×3×3×7
$1764=2\times2\times3\times3\times7\times7$1764=2×2×3×3×7×7

Medium
1min

Consider the following prime factorisations:

$12250=2\times5^3\times7^2$12250=2×53×72
$700=2^2\times5^2\times7$700=22×52×7

Easy
1min
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Outcomes

7.B2.6

Determine the greatest common factor for a variety of whole numbers up to 144 and the lowest common multiple for two and three whole numbers.

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