1. Whole Numbers
iGCSE (2021 Edition)
1.12 HCF and LCM
Interactive practice questions
Consider the following prime factorisations:
$180=2\times2\times3\times3\times5$180=2×2×3×3×5
$600=2\times2\times2\times3\times5\times5$600=2×2×2×3×5×5
Find the highest common factor of $180$180 and $600$600.
Easy
1min
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
Easy
1min
Consider the following prime factorisations:
$4900=2\times2\times5\times5\times7\times7$4900=2×2×5×5×7×7
$1750=2\times5\times5\times5\times7$1750=2×5×5×5×7
Medium
1min
Consider the following prime factorisations:
$140=2^2\times5\times7$140=22×5×7
$24500=2^2\times5^3\times7^2$24500=22×53×72
Easy
1min
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