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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:
5880 and 5145 is ____ 3430 and 10290 is ____ 5250 and 4375 is ____ 560 and 700 is ____ 13720 and 12005 is ____
1960 and 1470 is ____ 480 and 180 is ____ 450 and 540 is ____ 3375 and 2250 is ____ 1120 and 420 is ____
1372 and 784 is ____ 200 and 900 is ____ 2520 and 630 is ____ 504 and 252 is ____ 810 and 945 is ____
784 and 392 is ____ 588 and 1176 is ____ 6860 and 12005 is ____ 6615 and 4410 is ____ 5145 and 3087 is ____
1176 and 882 is ____ 2835 and 1575 is ____ 12005 and 19208 is ____ 480 and 420 is ____ 630 and 756 is ____
4200 and 3675 is ____ 1512 and 1134 is ____ 8575 and 9800 is ____ 216 and 180 is ____ 162 and 324 is ____
980 and 560 is ____ 756 and 672 is ____ 630 and 2520 is ____ 8575 and 15435 is ____ 200 and 300 is ____
810 and 405 is ____ 360 and 270 is ____ 200 and 160 is ____ 1125 and 1350 is ____ 630 and 840 is ____
1680 and 1890 is ____ 1260 and 2520 is ____ 9800 and 8575 is ____ 450 and 270 is ____ 756 and 882 is ____
1470 and 882 is ____ 700 and 600 is ____ 7350 and 6615 is ____ 1050 and 840 is ____ 300 and 540 is ____
720 and 450 is ____ 630 and 420 is ____ 112 and 392 is ____ 1764 and 2646 is ____ 980 and 3920 is ____
810 and 180 is ____ 5880 and 3675 is ____ 162 and 270 is ____ 1050 and 1470 is ____ 432 and 378 is ____
1125 and 1500 is ____ 120 and 96 is ____ 4116 and 3430 is ____ 560 and 420 is ____ 1470 and 1680 is ____
840 and 1260 is ____ 1575 and 1260 is ____ 3920 and 4410 is ____ 168 and 756 is ____ 750 and 1200 is ____
420 and 1260 is ____ 360 and 480 is ____ 945 and 630 is ____ 1260 and 2835 is ____ 1568 and 784 is ____
The Lowest Common Multiple (L.C.M.) of:
189 and 525 is ____ 60 and 168 is ____ 56 and 504 is ____ 90 and 160 is ____ 375 and 210 is ____
84 and 1536 is ____ 490 and 2016 is ____ 294 and 160 is ____ 40 and 720 is ____ 24 and 896 is ____
60 and 1792 is ____ 36 and 1152 is ____ 686 and 392 is ____ 350 and 480 is ____ 54 and 420 is ____
225 and 288 is ____ 56 and 216 is ____ 126 and 672 is ____ 24 and 224 is ____ 140 and 800 is ____
140 and 300 is ____ 1225 and 224 is ____ 150 and 840 is ____ 140 and 420 is ____ 315 and 240 is ____
90 and 1200 is ____ 210 and 750 is ____ 350 and 1440 is ____ 350 and 240 is ____ 90 and 216 is ____
315 and 504 is ____ 210 and 896 is ____ 735 and 2688 is ____ 875 and 1050 is ____ 60 and 2058 is ____
225 and 840 is ____ 315 and 60 is ____ 16 and 630 is ____ 525 and 252 is ____ 60 and 756 is ____
84 and 384 is ____ 1225 and 864 is ____ 1715 and 480 is ____ 150 and 1344 is ____ 735 and 840 is ____
294 and 480 is ____ 126 and 300 is ____ 315 and 168 is ____ 90 and 192 is ____ 210 and 576 is ____
875 and 240 is ____ 315 and 490 is ____ 525 and 3072 is ____ 56 and 630 is ____ 294 and 480 is ____
225 and 672 is ____ 150 and 225 is ____ 140 and 180 is ____ 210 and 875 is ____ 90 and 180 is ____
84 and 288 is ____ 735 and 600 is ____ 350 and 504 is ____ 150 and 108 is ____ 490 and 144 is ____
140 and 128 is ____ 90 and 672 is ____ 84 and 360 is ____ 315 and 96 is ____ 225 and 864 is ____
100 and 525 is ____ 90 and 588 is ____ 84 and 180 is ____ 1225 and 60 is ____ 490 and 320 is ____

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