1. Number

Middle Years

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

Approx 2 minutes

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

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

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

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