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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:
1680 and 630 is ____ 630 and 1134 is ____ 1400 and 1750 is ____ 360 and 80 is ____ 144 and 72 is ____
600 and 300 is ____ 216 and 252 is ____ 3087 and 1764 is ____ 675 and 405 is ____ 2205 and 5145 is ____
3150 and 700 is ____ 2250 and 1000 is ____ 216 and 180 is ____ 980 and 840 is ____ 1575 and 675 is ____
252 and 882 is ____ 810 and 270 is ____ 1260 and 630 is ____ 1080 and 405 is ____ 1764 and 3969 is ____
300 and 240 is ____ 1680 and 630 is ____ 360 and 120 is ____ 6615 and 2940 is ____ 1260 and 420 is ____
1050 and 1400 is ____ 840 and 1120 is ____ 945 and 2205 is ____ 720 and 630 is ____ 1125 and 450 is ____
1176 and 1568 is ____ 9800 and 8575 is ____ 144 and 108 is ____ 1960 and 1470 is ____ 840 and 420 is ____
1400 and 3150 is ____ 729 and 648 is ____ 2205 and 5880 is ____ 1764 and 588 is ____ 1568 and 784 is ____
168 and 96 is ____ 2835 and 945 is ____ 980 and 1260 is ____ 48 and 144 is ____ 700 and 1050 is ____
1323 and 3087 is ____ 240 and 480 is ____ 2450 and 3920 is ____ 1575 and 630 is ____ 2058 and 1176 is ____
5000 and 3125 is ____ 450 and 300 is ____ 324 and 252 is ____ 180 and 540 is ____ 252 and 672 is ____
450 and 1800 is ____ 450 and 750 is ____ 180 and 810 is ____ 320 and 80 is ____ 1568 and 1372 is ____
2205 and 6615 is ____ 2940 and 5880 is ____ 16807 and 14406 is ____ 3675 and 5880 is ____ 1764 and 1568 is ____
9800 and 11025 is ____ 1890 and 630 is ____ 270 and 324 is ____ 168 and 756 is ____ 2450 and 1470 is ____
3675 and 4200 is ____ 8575 and 6860 is ____ 2100 and 1750 is ____ 2625 and 3675 is ____ 3528 and 1323 is ____
The Lowest Common Multiple (L.C.M.) of:
60 and 360 is ____ 315 and 384 is ____ 225 and 112 is ____ 315 and 300 is ____ 225 and 1568 is ____
126 and 150 is ____ 196 and 672 is ____ 315 and 630 is ____ 36 and 882 is ____ 490 and 1344 is ____
315 and 672 is ____ 140 and 560 is ____ 36 and 448 is ____ 90 and 672 is ____ 140 and 448 is ____
525 and 96 is ____ 140 and 180 is ____ 84 and 1715 is ____ 90 and 432 is ____ 126 and 630 is ____
210 and 768 is ____ 1715 and 900 is ____ 315 and 2688 is ____ 525 and 768 is ____ 100 and 200 is ____
84 and 525 is ____ 150 and 1176 is ____ 686 and 180 is ____ 60 and 720 is ____ 84 and 1764 is ____
735 and 120 is ____ 210 and 1344 is ____ 150 and 60 is ____ 210 and 750 is ____ 625 and 1568 is ____
150 and 504 is ____ 350 and 180 is ____ 315 and 168 is ____ 36 and 360 is ____ 350 and 800 is ____
84 and 108 is ____ 140 and 392 is ____ 441 and 490 is ____ 140 and 504 is ____ 60 and 288 is ____
441 and 72 is ____ 210 and 288 is ____ 875 and 1200 is ____ 140 and 400 is ____ 441 and 108 is ____
250 and 80 is ____ 210 and 630 is ____ 210 and 224 is ____ 490 and 256 is ____ 150 and 1440 is ____
126 and 375 is ____ 1715 and 1152 is ____ 84 and 252 is ____ 294 and 192 is ____ 210 and 720 is ____
135 and 1470 is ____ 189 and 2048 is ____ 56 and 224 is ____ 735 and 448 is ____ 225 and 160 is ____
126 and 840 is ____ 735 and 525 is ____ 84 and 1050 is ____ 315 and 336 is ____ 525 and 288 is ____
140 and 768 is ____ 100 and 120 is ____ 441 and 80 is ____ 210 and 588 is ____ 315 and 60 is ____

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