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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:
980 and 3430 is ____ 980 and 784 is ____ 2940 and 3675 is ____ 750 and 1050 is ____ 1080 and 810 is ____
420 and 300 is ____ 378 and 1008 is ____ 420 and 560 is ____ 700 and 1750 is ____ 480 and 360 is ____
3087 and 3528 is ____ 756 and 504 is ____ 378 and 108 is ____ 810 and 540 is ____ 13720 and 5145 is ____
1050 and 630 is ____ 1323 and 378 is ____ 1200 and 450 is ____ 1764 and 882 is ____ 160 and 120 is ____
810 and 630 is ____ 4410 and 5880 is ____ 1000 and 1500 is ____ 1960 and 4410 is ____ 144 and 48 is ____
1050 and 700 is ____ 1890 and 630 is ____ 120 and 200 is ____ 1800 and 900 is ____ 216 and 108 is ____
700 and 500 is ____ 1575 and 450 is ____ 882 and 1764 is ____ 1890 and 1470 is ____ 672 and 336 is ____
3087 and 2646 is ____ 2940 and 4410 is ____ 750 and 1200 is ____ 700 and 420 is ____ 5880 and 4410 is ____
1372 and 3430 is ____ 588 and 336 is ____ 1680 and 1470 is ____ 540 and 300 is ____ 2744 and 1372 is ____
336 and 756 is ____ 1250 and 1500 is ____ 180 and 252 is ____ 168 and 112 is ____ 588 and 504 is ____
1568 and 1372 is ____ 504 and 630 is ____ 1260 and 1050 is ____ 360 and 630 is ____ 180 and 144 is ____
200 and 360 is ____ 1750 and 1400 is ____ 600 and 1050 is ____ 168 and 216 is ____ 2250 and 1500 is ____
180 and 270 is ____ 980 and 392 is ____ 2625 and 1125 is ____ 450 and 360 is ____ 420 and 480 is ____
420 and 300 is ____ 144 and 48 is ____ 630 and 882 is ____ 1250 and 2000 is ____ 1701 and 567 is ____
392 and 504 is ____ 252 and 588 is ____ 1500 and 1250 is ____ 6174 and 2058 is ____ 3675 and 5880 is ____
The Lowest Common Multiple (L.C.M.) of:
210 and 3072 is ____ 60 and 1512 is ____ 315 and 1200 is ____ 225 and 980 is ____ 294 and 504 is ____
210 and 350 is ____ 210 and 320 is ____ 525 and 288 is ____ 60 and 336 is ____ 1225 and 384 is ____
140 and 1536 is ____ 1225 and 432 is ____ 100 and 300 is ____ 350 and 360 is ____ 686 and 560 is ____
294 and 60 is ____ 875 and 240 is ____ 686 and 192 is ____ 350 and 1680 is ____ 210 and 336 is ____
210 and 490 is ____ 140 and 360 is ____ 225 and 1960 is ____ 735 and 432 is ____ 315 and 210 is ____
525 and 1176 is ____ 525 and 60 is ____ 250 and 72 is ____ 294 and 280 is ____ 250 and 240 is ____
210 and 504 is ____ 36 and 896 is ____ 1225 and 1715 is ____ 36 and 588 is ____ 210 and 384 is ____
294 and 3072 is ____ 126 and 540 is ____ 625 and 225 is ____ 90 and 840 is ____ 210 and 64 is ____
686 and 1400 is ____ 210 and 504 is ____ 36 and 294 is ____ 24 and 1000 is ____ 1225 and 2352 is ____
150 and 384 is ____ 210 and 270 is ____ 140 and 630 is ____ 1715 and 280 is ____ 315 and 1536 is ____
210 and 672 is ____ 196 and 192 is ____ 100 and 216 is ____ 375 and 360 is ____ 875 and 80 is ____
60 and 480 is ____ 294 and 504 is ____ 1029 and 720 is ____ 90 and 300 is ____ 60 and 252 is ____
250 and 672 is ____ 350 and 756 is ____ 875 and 1120 is ____ 100 and 1344 is ____ 315 and 160 is ____
210 and 840 is ____ 54 and 2744 is ____ 210 and 144 is ____ 150 and 1715 is ____ 225 and 180 is ____
294 and 100 is ____ 140 and 288 is ____ 250 and 1152 is ____ 210 and 1120 is ____ 150 and 96 is ____

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