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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:
300 and 700 is ____ 980 and 280 is ____ 2058 and 1176 is ____ 180 and 720 is ____ 900 and 1200 is ____
4410 and 5145 is ____ 1960 and 2940 is ____ 810 and 360 is ____ 192 and 168 is ____ 1890 and 1470 is ____
486 and 270 is ____ 630 and 840 is ____ 945 and 1575 is ____ 3528 and 1764 is ____ 112 and 448 is ____
432 and 108 is ____ 560 and 840 is ____ 3675 and 4725 is ____ 240 and 180 is ____ 588 and 882 is ____
378 and 252 is ____ 3675 and 3150 is ____ 240 and 200 is ____ 378 and 756 is ____ 1260 and 1890 is ____
630 and 252 is ____ 2000 and 500 is ____ 1960 and 980 is ____ 120 and 180 is ____ 5880 and 2205 is ____
240 and 120 is ____ 1470 and 1960 is ____ 120 and 180 is ____ 1250 and 1000 is ____ 882 and 756 is ____
450 and 270 is ____ 288 and 252 is ____ 216 and 270 is ____ 720 and 540 is ____ 3430 and 4116 is ____
1260 and 700 is ____ 3920 and 3430 is ____ 1764 and 784 is ____ 3675 and 3150 is ____ 720 and 360 is ____
5145 and 2205 is ____ 756 and 378 is ____ 420 and 1890 is ____ 980 and 3430 is ____ 750 and 1200 is ____
3430 and 5145 is ____ 3430 and 1470 is ____ 1400 and 2450 is ____ 1125 and 1575 is ____ 567 and 1512 is ____
980 and 840 is ____ 2646 and 882 is ____ 720 and 630 is ____ 630 and 420 is ____ 840 and 1470 is ____
1750 and 2450 is ____ 2100 and 2800 is ____ 2625 and 2100 is ____ 1470 and 6615 is ____ 5250 and 4725 is ____
540 and 1215 is ____ 2800 and 700 is ____ 1120 and 420 is ____ 2835 and 630 is ____ 500 and 800 is ____
480 and 540 is ____ 2940 and 1470 is ____ 200 and 240 is ____ 504 and 252 is ____ 882 and 2352 is ____
The Lowest Common Multiple (L.C.M.) of:
140 and 588 is ____ 1225 and 144 is ____ 150 and 180 is ____ 24 and 504 is ____ 90 and 1176 is ____
525 and 1008 is ____ 350 and 336 is ____ 525 and 600 is ____ 150 and 90 is ____ 210 and 840 is ____
350 and 48 is ____ 150 and 960 is ____ 315 and 2352 is ____ 84 and 224 is ____ 1715 and 1152 is ____
90 and 320 is ____ 56 and 80 is ____ 90 and 840 is ____ 735 and 1536 is ____ 210 and 896 is ____
315 and 504 is ____ 100 and 280 is ____ 150 and 630 is ____ 294 and 800 is ____ 735 and 600 is ____
126 and 252 is ____ 210 and 288 is ____ 100 and 288 is ____ 735 and 84 is ____ 1029 and 448 is ____
90 and 960 is ____ 60 and 1512 is ____ 150 and 192 is ____ 375 and 512 is ____ 126 and 480 is ____
294 and 360 is ____ 1029 and 480 is ____ 126 and 288 is ____ 1225 and 192 is ____ 36 and 240 is ____
135 and 1600 is ____ 686 and 1400 is ____ 1029 and 768 is ____ 686 and 240 is ____ 225 and 384 is ____
735 and 128 is ____ 225 and 144 is ____ 60 and 135 is ____ 210 and 240 is ____ 140 and 168 is ____
84 and 882 is ____ 225 and 525 is ____ 1029 and 64 is ____ 90 and 630 is ____ 90 and 48 is ____
189 and 1280 is ____ 1715 and 320 is ____ 135 and 40 is ____ 1715 and 432 is ____ 1225 and 168 is ____
441 and 168 is ____ 294 and 300 is ____ 525 and 288 is ____ 225 and 588 is ____ 875 and 360 is ____
54 and 192 is ____ 16 and 168 is ____ 60 and 2240 is ____ 1029 and 72 is ____ 54 and 1024 is ____
375 and 450 is ____ 100 and 135 is ____ 686 and 144 is ____ 90 and 768 is ____ 210 and 168 is ____

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