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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:
1764 and 2646 is ____ 630 and 840 is ____ 3675 and 1050 is ____ 96 and 120 is ____ 486 and 270 is ____
108 and 324 is ____ 1050 and 2450 is ____ 392 and 224 is ____ 1750 and 1250 is ____ 2520 and 1575 is ____
2058 and 1764 is ____ 252 and 336 is ____ 1125 and 3000 is ____ 504 and 336 is ____ 630 and 1680 is ____
700 and 1120 is ____ 1260 and 1680 is ____ 1764 and 3969 is ____ 216 and 486 is ____ 1470 and 630 is ____
840 and 630 is ____ 2625 and 3150 is ____ 1500 and 3000 is ____ 2450 and 3150 is ____ 2100 and 4725 is ____
2450 and 2800 is ____ 420 and 504 is ____ 1125 and 1575 is ____ 420 and 168 is ____ 630 and 360 is ____
1260 and 700 is ____ 3500 and 6125 is ____ 6860 and 3430 is ____ 630 and 504 is ____ 1134 and 252 is ____
540 and 450 is ____ 392 and 336 is ____ 1470 and 3675 is ____ 420 and 360 is ____ 3087 and 882 is ____
432 and 486 is ____ 5488 and 1372 is ____ 6615 and 2205 is ____ 945 and 810 is ____ 882 and 3969 is ____
2940 and 5145 is ____ 1050 and 3150 is ____ 2352 and 1470 is ____ 1500 and 1350 is ____ 360 and 420 is ____
1764 and 1176 is ____ 560 and 420 is ____ 1050 and 1890 is ____ 1575 and 1050 is ____ 2205 and 5880 is ____
378 and 1134 is ____ 3500 and 2625 is ____ 4200 and 2625 is ____ 504 and 1008 is ____ 672 and 588 is ____
13720 and 12005 is ____ 3675 and 2450 is ____ 2744 and 4116 is ____ 2450 and 1400 is ____ 3675 and 2625 is ____
2058 and 1176 is ____ 1470 and 1960 is ____ 448 and 224 is ____ 2520 and 2835 is ____ 5880 and 2205 is ____
3969 and 2646 is ____ 3430 and 980 is ____ 840 and 1680 is ____ 1008 and 882 is ____ 630 and 420 is ____
The Lowest Common Multiple (L.C.M.) of:
36 and 720 is ____ 126 and 1600 is ____ 140 and 630 is ____ 84 and 1536 is ____ 60 and 144 is ____
60 and 126 is ____ 315 and 672 is ____ 225 and 216 is ____ 490 and 1050 is ____ 490 and 144 is ____
81 and 672 is ____ 24 and 1152 is ____ 490 and 1960 is ____ 84 and 350 is ____ 100 and 336 is ____
1029 and 1152 is ____ 210 and 600 is ____ 210 and 216 is ____ 56 and 392 is ____ 441 and 750 is ____
60 and 1176 is ____ 1225 and 480 is ____ 40 and 96 is ____ 36 and 120 is ____ 735 and 72 is ____
210 and 48 is ____ 525 and 336 is ____ 100 and 1008 is ____ 350 and 490 is ____ 1715 and 360 is ____
315 and 168 is ____ 84 and 216 is ____ 1029 and 1792 is ____ 100 and 1008 is ____ 294 and 504 is ____
1225 and 1280 is ____ 350 and 2352 is ____ 210 and 480 is ____ 54 and 216 is ____ 735 and 504 is ____
140 and 252 is ____ 126 and 735 is ____ 315 and 525 is ____ 225 and 756 is ____ 60 and 800 is ____
315 and 1680 is ____ 84 and 1440 is ____ 315 and 392 is ____ 490 and 1008 is ____ 140 and 1008 is ____
150 and 240 is ____ 350 and 180 is ____ 210 and 784 is ____ 36 and 2016 is ____ 210 and 1440 is ____
441 and 112 is ____ 875 and 1008 is ____ 875 and 270 is ____ 441 and 256 is ____ 525 and 288 is ____
294 and 288 is ____ 84 and 1050 is ____ 60 and 864 is ____ 441 and 560 is ____ 90 and 630 is ____
250 and 980 is ____ 1029 and 882 is ____ 250 and 441 is ____ 196 and 840 is ____ 525 and 384 is ____
126 and 360 is ____ 140 and 216 is ____ 40 and 800 is ____ 1225 and 150 is ____ 90 and 36 is ____

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