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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:
270 and 540 is ____ 1470 and 4410 is ____ 280 and 1120 is ____ 1323 and 1764 is ____ 1680 and 1260 is ____
450 and 600 is ____ 1890 and 630 is ____ 1134 and 756 is ____ 3675 and 6615 is ____ 1575 and 900 is ____
2205 and 6615 is ____ 180 and 450 is ____ 405 and 1215 is ____ 4200 and 3675 is ____ 1750 and 1400 is ____
360 and 720 is ____ 80 and 200 is ____ 1176 and 784 is ____ 4410 and 5145 is ____ 5880 and 5145 is ____
9800 and 8575 is ____ 432 and 486 is ____ 3675 and 5145 is ____ 420 and 240 is ____ 840 and 1890 is ____
324 and 252 is ____ 240 and 540 is ____ 1470 and 6615 is ____ 750 and 300 is ____ 162 and 108 is ____
1260 and 420 is ____ 162 and 486 is ____ 675 and 810 is ____ 1890 and 1680 is ____ 4900 and 7350 is ____
6174 and 5488 is ____ 1680 and 630 is ____ 700 and 1260 is ____ 630 and 378 is ____ 1680 and 1260 is ____
2100 and 1050 is ____ 1470 and 3430 is ____ 1500 and 1350 is ____ 3675 and 1575 is ____ 3000 and 1125 is ____
840 and 1680 is ____ 240 and 200 is ____ 2625 and 1575 is ____ 1134 and 756 is ____ 450 and 1200 is ____
1750 and 7000 is ____ 108 and 72 is ____ 1050 and 1200 is ____ 980 and 784 is ____ 1008 and 1134 is ____
392 and 336 is ____ 216 and 72 is ____ 252 and 324 is ____ 5880 and 4410 is ____ 336 and 252 is ____
4410 and 5145 is ____ 1372 and 1764 is ____ 112 and 392 is ____ 1470 and 1890 is ____ 540 and 486 is ____
560 and 980 is ____ 144 and 96 is ____ 2205 and 1323 is ____ 2100 and 700 is ____ 3675 and 6125 is ____
120 and 180 is ____ 1575 and 1890 is ____ 2940 and 2450 is ____ 945 and 756 is ____ 270 and 945 is ____
The Lowest Common Multiple (L.C.M.) of:
350 and 200 is ____ 60 and 252 is ____ 150 and 160 is ____ 40 and 1280 is ____ 210 and 420 is ____
36 and 1680 is ____ 150 and 280 is ____ 150 and 1225 is ____ 315 and 210 is ____ 225 and 315 is ____
135 and 1372 is ____ 250 and 1152 is ____ 84 and 576 is ____ 126 and 324 is ____ 210 and 735 is ____
210 and 84 is ____ 84 and 896 is ____ 735 and 448 is ____ 490 and 1680 is ____ 1715 and 560 is ____
525 and 350 is ____ 225 and 576 is ____ 140 and 576 is ____ 1715 and 96 is ____ 140 and 300 is ____
375 and 576 is ____ 875 and 1600 is ____ 54 and 1050 is ____ 140 and 400 is ____ 126 and 1440 is ____
735 and 448 is ____ 490 and 540 is ____ 2401 and 1536 is ____ 735 and 600 is ____ 1225 and 2240 is ____
189 and 180 is ____ 90 and 450 is ____ 100 and 1120 is ____ 490 and 210 is ____ 294 and 192 is ____
250 and 96 is ____ 90 and 480 is ____ 1029 and 392 is ____ 84 and 768 is ____ 490 and 360 is ____
1225 and 800 is ____ 1029 and 360 is ____ 294 and 288 is ____ 189 and 1680 is ____ 210 and 576 is ____
525 and 1050 is ____ 90 and 900 is ____ 90 and 320 is ____ 1029 and 1568 is ____ 60 and 210 is ____
441 and 270 is ____ 56 and 700 is ____ 735 and 1792 is ____ 189 and 672 is ____ 140 and 1680 is ____
135 and 560 is ____ 196 and 240 is ____ 126 and 3072 is ____ 210 and 192 is ____ 294 and 336 is ____
250 and 840 is ____ 735 and 1400 is ____ 210 and 3072 is ____ 180 and 90 is ____ 441 and 2352 is ____
735 and 480 is ____ 60 and 210 is ____ 140 and 560 is ____ 375 and 576 is ____ 525 and 60 is ____

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