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Worksheet 4 - The Highest Common Factor (HCF) and the Lowest Common Multiple (LCM)  (Difficulty level: Very Hard)
The Highest Common Factor (H.C.F.) of:
420 and 756 is ____ 630 and 1008 is ____ 1764 and 1372 is ____ 2205 and 1470 is ____ 4900 and 4410 is ____
180 and 240 is ____ 1960 and 980 is ____ 8575 and 11025 is ____ 4200 and 3675 is ____ 1008 and 882 is ____
168 and 504 is ____ 336 and 252 is ____ 1260 and 1050 is ____ 630 and 420 is ____ 840 and 1050 is ____
1050 and 600 is ____ 180 and 810 is ____ 336 and 588 is ____ 1134 and 630 is ____ 450 and 630 is ____
1176 and 2646 is ____ 450 and 270 is ____ 540 and 720 is ____ 1890 and 630 is ____ 1764 and 2352 is ____
405 and 324 is ____ 1120 and 980 is ____ 4802 and 3430 is ____ 840 and 700 is ____ 2646 and 2058 is ____
420 and 672 is ____ 588 and 1764 is ____ 1890 and 1680 is ____ 600 and 500 is ____ 504 and 252 is ____
945 and 1890 is ____ 7203 and 6174 is ____ 2800 and 1050 is ____ 336 and 252 is ____ 168 and 192 is ____
3150 and 1050 is ____ 200 and 120 is ____ 80 and 360 is ____ 180 and 300 is ____ 216 and 108 is ____
1750 and 500 is ____ 567 and 243 is ____ 675 and 810 is ____ 5145 and 3675 is ____ 1875 and 750 is ____
1050 and 2100 is ____ 980 and 700 is ____ 8575 and 5145 is ____ 108 and 216 is ____ 1960 and 4410 is ____
420 and 588 is ____ 216 and 72 is ____ 270 and 324 is ____ 1575 and 3150 is ____ 2352 and 2646 is ____
1890 and 630 is ____ 216 and 192 is ____ 2940 and 4410 is ____ 2450 and 11025 is ____ 1875 and 2250 is ____
810 and 675 is ____ 1500 and 1125 is ____ 720 and 630 is ____ 588 and 1470 is ____ 630 and 1008 is ____
1764 and 882 is ____ 144 and 168 is ____ 672 and 168 is ____ 945 and 2520 is ____ 120 and 180 is ____
The Lowest Common Multiple (L.C.M.) of:
126 and 540 is ____ 1715 and 2240 is ____ 135 and 490 is ____ 210 and 1225 is ____ 140 and 288 is ____
294 and 1050 is ____ 54 and 192 is ____ 735 and 3584 is ____ 90 and 900 is ____ 294 and 1176 is ____
60 and 840 is ____ 735 and 960 is ____ 90 and 1280 is ____ 525 and 896 is ____ 140 and 360 is ____
525 and 72 is ____ 686 and 300 is ____ 735 and 112 is ____ 525 and 576 is ____ 90 and 1344 is ____
40 and 256 is ____ 54 and 200 is ____ 84 and 640 is ____ 60 and 324 is ____ 350 and 448 is ____
210 and 90 is ____ 140 and 216 is ____ 686 and 1344 is ____ 350 and 480 is ____ 90 and 36 is ____
210 and 2058 is ____ 490 and 192 is ____ 90 and 672 is ____ 490 and 672 is ____ 315 and 300 is ____
140 and 168 is ____ 294 and 225 is ____ 225 and 2352 is ____ 294 and 630 is ____ 210 and 144 is ____
735 and 672 is ____ 1715 and 1344 is ____ 210 and 600 is ____ 140 and 980 is ____ 315 and 1680 is ____
150 and 784 is ____ 210 and 252 is ____ 189 and 224 is ____ 54 and 350 is ____ 196 and 378 is ____
735 and 3072 is ____ 2401 and 490 is ____ 150 and 448 is ____ 150 and 288 is ____ 225 and 192 is ____
735 and 40 is ____ 735 and 140 is ____ 84 and 288 is ____ 60 and 1568 is ____ 140 and 120 is ____
735 and 480 is ____ 126 and 768 is ____ 84 and 128 is ____ 100 and 1120 is ____ 126 and 630 is ____
16 and 784 is ____ 225 and 180 is ____ 40 and 1920 is ____ 210 and 896 is ____ 60 and 240 is ____
210 and 200 is ____ 90 and 320 is ____ 135 and 700 is ____ 735 and 2016 is ____ 315 and 192 is ____

Copyright 2009 - Adam Malinowski. (Member of CAL, Statutory Licence Schemes)