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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:
630 and 2835 is ____ 2025 and 1575 is ____ 7350 and 9800 is ____ 1260 and 840 is ____ 2100 and 1050 is ____
2625 and 2100 is ____ 504 and 882 is ____ 560 and 1120 is ____ 3375 and 2250 is ____ 980 and 1120 is ____
1080 and 1215 is ____ 2058 and 2646 is ____ 360 and 270 is ____ 1960 and 1470 is ____ 540 and 450 is ____
2940 and 2450 is ____ 270 and 450 is ____ 7350 and 6125 is ____ 882 and 588 is ____ 810 and 360 is ____
144 and 108 is ____ 2450 and 6125 is ____ 840 and 420 is ____ 216 and 192 is ____ 2025 and 675 is ____
900 and 1800 is ____ 900 and 500 is ____ 1890 and 1575 is ____ 180 and 360 is ____ 500 and 400 is ____
840 and 1890 is ____ 1050 and 1260 is ____ 1575 and 3150 is ____ 378 and 756 is ____ 1350 and 750 is ____
756 and 588 is ____ 216 and 486 is ____ 180 and 540 is ____ 48 and 112 is ____ 840 and 280 is ____
2625 and 3675 is ____ 400 and 200 is ____ 200 and 300 is ____ 1260 and 1470 is ____ 720 and 450 is ____
2625 and 1050 is ____ 5250 and 7875 is ____ 600 and 900 is ____ 1134 and 378 is ____ 1470 and 2058 is ____
980 and 3430 is ____ 240 and 200 is ____ 588 and 1470 is ____ 756 and 672 is ____ 3675 and 2625 is ____
270 and 675 is ____ 5488 and 6174 is ____ 1323 and 567 is ____ 1120 and 560 is ____ 9800 and 4900 is ____
1575 and 2520 is ____ 750 and 600 is ____ 588 and 2646 is ____ 1470 and 1680 is ____ 288 and 216 is ____
600 and 750 is ____ 1050 and 2100 is ____ 224 and 392 is ____ 1260 and 2205 is ____ 5488 and 2744 is ____
1875 and 750 is ____ 980 and 4410 is ____ 300 and 200 is ____ 2835 and 1890 is ____ 588 and 882 is ____
The Lowest Common Multiple (L.C.M.) of:
525 and 1344 is ____ 315 and 180 is ____ 36 and 250 is ____ 56 and 90 is ____ 735 and 128 is ____
441 and 320 is ____ 350 and 128 is ____ 36 and 480 is ____ 189 and 350 is ____ 225 and 1120 is ____
875 and 768 is ____ 525 and 576 is ____ 54 and 720 is ____ 126 and 192 is ____ 210 and 288 is ____
210 and 288 is ____ 375 and 384 is ____ 196 and 2016 is ____ 294 and 168 is ____ 525 and 800 is ____
525 and 360 is ____ 100 and 192 is ____ 225 and 336 is ____ 315 and 378 is ____ 350 and 252 is ____
189 and 392 is ____ 315 and 144 is ____ 735 and 480 is ____ 140 and 384 is ____ 150 and 384 is ____
490 and 120 is ____ 350 and 576 is ____ 350 and 672 is ____ 735 and 315 is ____ 525 and 490 is ____
225 and 672 is ____ 875 and 315 is ____ 490 and 336 is ____ 135 and 1200 is ____ 84 and 420 is ____
189 and 735 is ____ 525 and 1152 is ____ 210 and 180 is ____ 315 and 560 is ____ 210 and 576 is ____
225 and 588 is ____ 315 and 192 is ____ 84 and 48 is ____ 735 and 192 is ____ 490 and 180 is ____
189 and 504 is ____ 210 and 375 is ____ 875 and 840 is ____ 350 and 288 is ____ 84 and 324 is ____
140 and 864 is ____ 294 and 180 is ____ 90 and 288 is ____ 84 and 882 is ____ 60 and 1960 is ____
294 and 784 is ____ 315 and 288 is ____ 90 and 48 is ____ 441 and 216 is ____ 36 and 1344 is ____
90 and 1400 is ____ 350 and 480 is ____ 196 and 210 is ____ 126 and 1920 is ____ 350 and 252 is ____
189 and 1960 is ____ 441 and 384 is ____ 490 and 2352 is ____ 525 and 72 is ____ 126 and 72 is ____

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