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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:
4200 and 2100 is ____ 504 and 252 is ____ 504 and 252 is ____ 1764 and 2058 is ____ 675 and 1350 is ____
1050 and 840 is ____ 6615 and 3675 is ____ 392 and 168 is ____ 252 and 504 is ____ 378 and 1323 is ____
4200 and 3675 is ____ 2835 and 2520 is ____ 900 and 1125 is ____ 2450 and 2100 is ____ 1323 and 1512 is ____
1800 and 450 is ____ 4410 and 2450 is ____ 1764 and 882 is ____ 450 and 810 is ____ 2450 and 1470 is ____
1764 and 1470 is ____ 900 and 1050 is ____ 420 and 480 is ____ 2352 and 882 is ____ 120 and 160 is ____
1960 and 3430 is ____ 840 and 560 is ____ 15435 and 12005 is ____ 4375 and 5250 is ____ 3430 and 4410 is ____
1500 and 1250 is ____ 5145 and 6174 is ____ 1050 and 2625 is ____ 700 and 1120 is ____ 13720 and 6860 is ____
1323 and 945 is ____ 1890 and 840 is ____ 1680 and 840 is ____ 630 and 1470 is ____ 1470 and 3920 is ____
810 and 270 is ____ 5880 and 4410 is ____ 630 and 504 is ____ 360 and 120 is ____ 630 and 1260 is ____
1680 and 1260 is ____ 2205 and 3087 is ____ 900 and 800 is ____ 700 and 840 is ____ 2520 and 1260 is ____
1470 and 2205 is ____ 11025 and 8575 is ____ 5145 and 8575 is ____ 1575 and 450 is ____ 588 and 420 is ____
6615 and 2205 is ____ 810 and 720 is ____ 560 and 1120 is ____ 1680 and 1050 is ____ 480 and 360 is ____
2100 and 1890 is ____ 2646 and 2058 is ____ 840 and 630 is ____ 4200 and 1050 is ____ 1372 and 588 is ____
120 and 320 is ____ 300 and 1350 is ____ 1890 and 1260 is ____ 900 and 300 is ____ 2940 and 5145 is ____
3675 and 4200 is ____ 2450 and 7350 is ____ 1575 and 2205 is ____ 700 and 420 is ____ 1400 and 1050 is ____
The Lowest Common Multiple (L.C.M.) of:
126 and 448 is ____ 735 and 112 is ____ 504 and 126 is ____ 294 and 80 is ____ 210 and 360 is ____
150 and 2240 is ____ 54 and 1400 is ____ 150 and 800 is ____ 140 and 1120 is ____ 36 and 1176 is ____
315 and 144 is ____ 126 and 1344 is ____ 490 and 540 is ____ 210 and 768 is ____ 210 and 126 is ____
150 and 480 is ____ 525 and 840 is ____ 210 and 960 is ____ 100 and 640 is ____ 210 and 1008 is ____
294 and 576 is ____ 1225 and 240 is ____ 875 and 3136 is ____ 375 and 144 is ____ 350 and 896 is ____
135 and 288 is ____ 100 and 80 is ____ 135 and 672 is ____ 294 and 180 is ____ 140 and 672 is ____
126 and 168 is ____ 150 and 240 is ____ 315 and 2744 is ____ 350 and 1792 is ____ 210 and 168 is ____
490 and 480 is ____ 1715 and 864 is ____ 490 and 504 is ____ 90 and 1960 is ____ 294 and 288 is ____
250 and 1120 is ____ 210 and 96 is ____ 210 and 300 is ____ 1029 and 240 is ____ 84 and 1680 is ____
294 and 588 is ____ 126 and 1470 is ____ 250 and 336 is ____ 81 and 480 is ____ 350 and 504 is ____
315 and 560 is ____ 525 and 384 is ____ 196 and 980 is ____ 490 and 96 is ____ 350 and 336 is ____
525 and 96 is ____ 150 and 840 is ____ 189 and 720 is ____ 294 and 144 is ____ 126 and 300 is ____
24 and 1792 is ____ 490 and 504 is ____ 1715 and 56 is ____ 350 and 200 is ____ 150 and 360 is ____
90 and 480 is ____ 210 and 120 is ____ 315 and 90 is ____ 84 and 168 is ____ 315 and 490 is ____
140 and 450 is ____ 350 and 576 is ____ 225 and 240 is ____ 350 and 240 is ____ 24 and 100 is ____

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