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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:
1050 and 2800 is ____ 1050 and 700 is ____ 1470 and 1260 is ____ 810 and 630 is ____ 112 and 336 is ____
3375 and 1500 is ____ 756 and 1008 is ____ 5145 and 12005 is ____ 1120 and 980 is ____ 11025 and 9800 is ____
2520 and 2835 is ____ 280 and 120 is ____ 1750 and 7000 is ____ 300 and 240 is ____ 1470 and 2940 is ____
1050 and 700 is ____ 1890 and 1260 is ____ 280 and 700 is ____ 2450 and 2100 is ____ 252 and 672 is ____
1470 and 4410 is ____ 200 and 120 is ____ 840 and 280 is ____ 1125 and 1350 is ____ 700 and 2450 is ____
420 and 1680 is ____ 504 and 378 is ____ 1764 and 392 is ____ 500 and 750 is ____ 700 and 2450 is ____
672 and 588 is ____ 2250 and 1125 is ____ 1350 and 1125 is ____ 630 and 450 is ____ 300 and 180 is ____
882 and 378 is ____ 120 and 300 is ____ 420 and 1260 is ____ 252 and 756 is ____ 1764 and 2646 is ____
72 and 180 is ____ 3675 and 3150 is ____ 840 and 1890 is ____ 1890 and 2520 is ____ 1134 and 252 is ____
2646 and 2205 is ____ 588 and 504 is ____ 2940 and 980 is ____ 180 and 450 is ____ 8575 and 2450 is ____
756 and 252 is ____ 1470 and 420 is ____ 270 and 540 is ____ 2450 and 1960 is ____ 980 and 784 is ____
1890 and 1470 is ____ 180 and 108 is ____ 1176 and 980 is ____ 1470 and 420 is ____ 2205 and 1890 is ____
3150 and 2625 is ____ 980 and 280 is ____ 336 and 588 is ____ 160 and 240 is ____ 2450 and 2800 is ____
900 and 675 is ____ 648 and 324 is ____ 560 and 980 is ____ 7350 and 3675 is ____ 420 and 1260 is ____
280 and 1120 is ____ 810 and 720 is ____ 192 and 144 is ____ 450 and 1575 is ____ 600 and 900 is ____
The Lowest Common Multiple (L.C.M.) of:
735 and 768 is ____ 140 and 480 is ____ 735 and 54 is ____ 315 and 64 is ____ 210 and 200 is ____
126 and 1120 is ____ 56 and 600 is ____ 490 and 192 is ____ 686 and 840 is ____ 1225 and 500 is ____
36 and 192 is ____ 350 and 576 is ____ 210 and 336 is ____ 210 and 784 is ____ 126 and 600 is ____
735 and 504 is ____ 686 and 840 is ____ 294 and 280 is ____ 350 and 240 is ____ 84 and 200 is ____
60 and 1029 is ____ 490 and 240 is ____ 294 and 192 is ____ 525 and 240 is ____ 350 and 500 is ____
1029 and 336 is ____ 100 and 224 is ____ 350 and 96 is ____ 90 and 120 is ____ 84 and 300 is ____
126 and 144 is ____ 210 and 480 is ____ 84 and 300 is ____ 210 and 192 is ____ 294 and 768 is ____
140 and 315 is ____ 441 and 1344 is ____ 1029 and 720 is ____ 84 and 960 is ____ 294 and 1792 is ____
140 and 686 is ____ 126 and 336 is ____ 36 and 96 is ____ 24 and 48 is ____ 525 and 560 is ____
126 and 224 is ____ 225 and 72 is ____ 686 and 2058 is ____ 375 and 2016 is ____ 315 and 960 is ____
735 and 378 is ____ 40 and 300 is ____ 350 and 108 is ____ 375 and 768 is ____ 350 and 168 is ____
1715 and 576 is ____ 210 and 2688 is ____ 350 and 480 is ____ 90 and 320 is ____ 350 and 1600 is ____
126 and 768 is ____ 735 and 420 is ____ 210 and 576 is ____ 441 and 96 is ____ 225 and 588 is ____
84 and 360 is ____ 140 and 192 is ____ 60 and 216 is ____ 60 and 576 is ____ 135 and 2016 is ____
100 and 288 is ____ 1715 and 960 is ____ 294 and 756 is ____ 315 and 100 is ____ 84 and 1372 is ____

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