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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:
3430 and 980 is ____ 1260 and 1470 is ____ 450 and 810 is ____ 980 and 2940 is ____ 4900 and 11025 is ____
192 and 96 is ____ 2100 and 3150 is ____ 2250 and 2000 is ____ 1350 and 600 is ____ 160 and 200 is ____
180 and 720 is ____ 240 and 360 is ____ 1050 and 300 is ____ 3969 and 2646 is ____ 480 and 360 is ____
1470 and 2352 is ____ 450 and 270 is ____ 252 and 1134 is ____ 4725 and 1050 is ____ 540 and 180 is ____
24010 and 21609 is ____ 1470 and 1176 is ____ 252 and 72 is ____ 300 and 750 is ____ 1050 and 1260 is ____
1120 and 420 is ____ 420 and 504 is ____ 1500 and 1750 is ____ 324 and 288 is ____ 4725 and 4200 is ____
1260 and 840 is ____ 14406 and 12005 is ____ 540 and 240 is ____ 1008 and 252 is ____ 2800 and 1050 is ____
700 and 420 is ____ 420 and 1050 is ____ 4725 and 1575 is ____ 1764 and 392 is ____ 2646 and 3087 is ____
360 and 480 is ____ 630 and 450 is ____ 1176 and 784 is ____ 2646 and 2352 is ____ 756 and 420 is ____
756 and 1323 is ____ 1470 and 588 is ____ 900 and 1350 is ____ 2646 and 882 is ____ 4410 and 3920 is ____
4410 and 2450 is ____ 108 and 180 is ____ 504 and 1008 is ____ 1260 and 2520 is ____ 180 and 540 is ____
2646 and 2205 is ____ 360 and 540 is ____ 1350 and 1200 is ____ 1764 and 588 is ____ 2625 and 4200 is ____
420 and 630 is ____ 1120 and 980 is ____ 420 and 756 is ____ 1400 and 2450 is ____ 1764 and 882 is ____
4410 and 3920 is ____ 3675 and 3150 is ____ 4375 and 7875 is ____ 540 and 120 is ____ 504 and 378 is ____
2940 and 2205 is ____ 1470 and 420 is ____ 300 and 450 is ____ 840 and 1890 is ____ 192 and 96 is ____
The Lowest Common Multiple (L.C.M.) of:
294 and 180 is ____ 735 and 140 is ____ 294 and 864 is ____ 90 and 560 is ____ 60 and 150 is ____
1225 and 210 is ____ 490 and 588 is ____ 126 and 1792 is ____ 90 and 1225 is ____ 490 and 320 is ____
735 and 1008 is ____ 735 and 1960 is ____ 150 and 1008 is ____ 294 and 400 is ____ 490 and 700 is ____
90 and 960 is ____ 225 and 336 is ____ 126 and 48 is ____ 210 and 1536 is ____ 1715 and 420 is ____
150 and 490 is ____ 686 and 1120 is ____ 250 and 980 is ____ 1225 and 2688 is ____ 210 and 504 is ____
140 and 400 is ____ 1225 and 126 is ____ 140 and 378 is ____ 196 and 840 is ____ 126 and 300 is ____
210 and 576 is ____ 315 and 450 is ____ 525 and 630 is ____ 1715 and 64 is ____ 350 and 672 is ____
90 and 525 is ____ 375 and 768 is ____ 210 and 280 is ____ 210 and 750 is ____ 56 and 294 is ____
90 and 588 is ____ 40 and 320 is ____ 16 and 630 is ____ 16 and 512 is ____ 40 and 896 is ____
84 and 560 is ____ 126 and 882 is ____ 525 and 980 is ____ 196 and 700 is ____ 84 and 360 is ____
210 and 640 is ____ 350 and 60 is ____ 126 and 840 is ____ 225 and 392 is ____ 315 and 960 is ____
735 and 400 is ____ 60 and 288 is ____ 735 and 800 is ____ 196 and 840 is ____ 100 and 800 is ____
126 and 392 is ____ 210 and 1792 is ____ 294 and 448 is ____ 525 and 504 is ____ 90 and 120 is ____
126 and 72 is ____ 36 and 150 is ____ 16 and 784 is ____ 140 and 576 is ____ 1225 and 432 is ____
490 and 480 is ____ 84 and 864 is ____ 1225 and 1120 is ____ 56 and 120 is ____ 84 and 270 is ____

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