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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:
2835 and 2520 is ____ 5145 and 6615 is ____ 4802 and 14406 is ____ 980 and 2450 is ____ 504 and 630 is ____
180 and 120 is ____ 756 and 252 is ____ 784 and 588 is ____ 120 and 180 is ____ 7875 and 4375 is ____
180 and 540 is ____ 1080 and 1215 is ____ 900 and 1350 is ____ 4116 and 3087 is ____ 840 and 1120 is ____
2058 and 2352 is ____ 2625 and 4725 is ____ 700 and 2800 is ____ 3430 and 2744 is ____ 480 and 240 is ____
588 and 2646 is ____ 1008 and 882 is ____ 144 and 120 is ____ 6615 and 3675 is ____ 504 and 336 is ____
216 and 270 is ____ 504 and 378 is ____ 3430 and 2450 is ____ 240 and 300 is ____ 2646 and 3528 is ____
1875 and 1500 is ____ 10290 and 9261 is ____ 2205 and 882 is ____ 360 and 180 is ____ 270 and 720 is ____
700 and 840 is ____ 300 and 120 is ____ 945 and 1575 is ____ 3500 and 4375 is ____ 2940 and 5145 is ____
750 and 3000 is ____ 4200 and 1050 is ____ 336 and 280 is ____ 1764 and 882 is ____ 1050 and 700 is ____
1512 and 1323 is ____ 720 and 270 is ____ 80 and 280 is ____ 240 and 180 is ____ 1680 and 1470 is ____
4410 and 3675 is ____ 192 and 144 is ____ 1890 and 420 is ____ 378 and 756 is ____ 300 and 480 is ____
784 and 1372 is ____ 3150 and 2800 is ____ 840 and 420 is ____ 4200 and 2625 is ____ 420 and 840 is ____
3087 and 882 is ____ 1701 and 1512 is ____ 720 and 180 is ____ 560 and 280 is ____ 1176 and 2352 is ____
420 and 588 is ____ 4375 and 3500 is ____ 700 and 1400 is ____ 1176 and 588 is ____ 10290 and 3430 is ____
756 and 336 is ____ 240 and 360 is ____ 3430 and 6860 is ____ 7000 and 1750 is ____ 2250 and 750 is ____
The Lowest Common Multiple (L.C.M.) of:
36 and 1536 is ____ 56 and 1960 is ____ 150 and 420 is ____ 84 and 1344 is ____ 210 and 224 is ____
60 and 168 is ____ 1225 and 54 is ____ 225 and 189 is ____ 189 and 480 is ____ 252 and 84 is ____
60 and 640 is ____ 350 and 378 is ____ 60 and 168 is ____ 24 and 448 is ____ 490 and 320 is ____
350 and 576 is ____ 1225 and 288 is ____ 36 and 2048 is ____ 315 and 720 is ____ 315 and 360 is ____
84 and 336 is ____ 441 and 672 is ____ 350 and 360 is ____ 1029 and 1344 is ____ 24 and 432 is ____
315 and 180 is ____ 90 and 504 is ____ 40 and 392 is ____ 735 and 144 is ____ 1715 and 280 is ____
60 and 432 is ____ 490 and 420 is ____ 60 and 140 is ____ 525 and 432 is ____ 196 and 420 is ____
525 and 2016 is ____ 735 and 144 is ____ 140 and 768 is ____ 735 and 540 is ____ 90 and 270 is ____
525 and 360 is ____ 126 and 336 is ____ 90 and 2352 is ____ 210 and 384 is ____ 350 and 168 is ____
126 and 1176 is ____ 875 and 128 is ____ 1225 and 2304 is ____ 90 and 168 is ____ 189 and 1152 is ____
126 and 378 is ____ 210 and 224 is ____ 735 and 336 is ____ 490 and 288 is ____ 54 and 252 is ____
54 and 420 is ____ 294 and 216 is ____ 1875 and 375 is ____ 1029 and 1536 is ____ 210 and 126 is ____
1029 and 1792 is ____ 441 and 288 is ____ 525 and 3136 is ____ 294 and 72 is ____ 81 and 1680 is ____
250 and 240 is ____ 490 and 1536 is ____ 350 and 224 is ____ 350 and 378 is ____ 210 and 864 is ____
40 and 420 is ____ 140 and 768 is ____ 84 and 288 is ____ 24 and 840 is ____ 490 and 450 is ____

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