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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:
810 and 270 is ____ 588 and 2646 is ____ 756 and 588 is ____ 750 and 450 is ____ 420 and 1470 is ____
1960 and 2940 is ____ 882 and 2058 is ____ 567 and 756 is ____ 280 and 1260 is ____ 1260 and 945 is ____
5880 and 5145 is ____ 1575 and 1350 is ____ 756 and 882 is ____ 1470 and 630 is ____ 1050 and 630 is ____
1680 and 1260 is ____ 750 and 1350 is ____ 1176 and 2646 is ____ 1372 and 1568 is ____ 1260 and 1050 is ____
840 and 1050 is ____ 700 and 2100 is ____ 2800 and 1750 is ____ 4410 and 3675 is ____ 360 and 270 is ____
2100 and 4200 is ____ 840 and 1890 is ____ 4410 and 2940 is ____ 1260 and 980 is ____ 2352 and 1764 is ____
840 and 630 is ____ 400 and 300 is ____ 3969 and 882 is ____ 900 and 1200 is ____ 1260 and 1050 is ____
672 and 588 is ____ 108 and 216 is ____ 540 and 120 is ____ 3087 and 2646 is ____ 504 and 1008 is ____
2940 and 5880 is ____ 2100 and 3150 is ____ 4116 and 2058 is ____ 2100 and 4725 is ____ 2625 and 1050 is ____
378 and 324 is ____ 567 and 1134 is ____ 1050 and 1260 is ____ 2835 and 2520 is ____ 1750 and 7000 is ____
2500 and 1875 is ____ 900 and 700 is ____ 280 and 360 is ____ 1050 and 1575 is ____ 420 and 504 is ____
200 and 500 is ____ 162 and 108 is ____ 1568 and 1764 is ____ 1764 and 1176 is ____ 1050 and 900 is ____
48 and 144 is ____ 180 and 360 is ____ 1125 and 1350 is ____ 1176 and 392 is ____ 1200 and 1050 is ____
1764 and 1568 is ____ 1260 and 630 is ____ 2835 and 630 is ____ 168 and 112 is ____ 300 and 1200 is ____
320 and 80 is ____ 6174 and 5145 is ____ 1134 and 1008 is ____ 1125 and 900 is ____ 324 and 216 is ____
The Lowest Common Multiple (L.C.M.) of:
100 and 2240 is ____ 441 and 160 is ____ 60 and 336 is ____ 140 and 196 is ____ 490 and 840 is ____
350 and 1920 is ____ 350 and 2352 is ____ 375 and 2688 is ____ 150 and 1200 is ____ 350 and 168 is ____
84 and 100 is ____ 686 and 288 is ____ 126 and 896 is ____ 210 and 54 is ____ 84 and 336 is ____
140 and 448 is ____ 294 and 192 is ____ 126 and 960 is ____ 196 and 560 is ____ 625 and 1536 is ____
225 and 768 is ____ 140 and 1728 is ____ 1715 and 640 is ____ 54 and 1680 is ____ 490 and 180 is ____
490 and 1176 is ____ 875 and 1536 is ____ 441 and 400 is ____ 1715 and 800 is ____ 24 and 168 is ____
490 and 960 is ____ 315 and 384 is ____ 126 and 350 is ____ 126 and 24 is ____ 294 and 84 is ____
294 and 504 is ____ 24 and 448 is ____ 90 and 100 is ____ 54 and 640 is ____ 126 and 60 is ____
126 and 288 is ____ 16 and 980 is ____ 90 and 84 is ____ 375 and 360 is ____ 441 and 896 is ____
150 and 240 is ____ 441 and 1120 is ____ 60 and 168 is ____ 490 and 1152 is ____ 56 and 420 is ____
126 and 1008 is ____ 84 and 192 is ____ 84 and 100 is ____ 1715 and 2744 is ____ 210 and 480 is ____
189 and 80 is ____ 625 and 784 is ____ 90 and 500 is ____ 84 and 384 is ____ 735 and 540 is ____
294 and 560 is ____ 735 and 1225 is ____ 126 and 96 is ____ 150 and 768 is ____ 60 and 560 is ____
140 and 1344 is ____ 525 and 108 is ____ 315 and 1960 is ____ 150 and 225 is ____ 36 and 72 is ____
294 and 576 is ____ 1029 and 128 is ____ 135 and 768 is ____ 140 and 1512 is ____ 225 and 84 is ____

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