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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:
672 and 252 is ____ 540 and 240 is ____ 1050 and 1260 is ____ 270 and 405 is ____ 216 and 324 is ____
1120 and 420 is ____ 2205 and 1470 is ____ 1200 and 1350 is ____ 1400 and 1050 is ____ 108 and 162 is ____
840 and 420 is ____ 630 and 420 is ____ 486 and 324 is ____ 1890 and 1050 is ____ 6615 and 1470 is ____
980 and 1176 is ____ 280 and 420 is ____ 300 and 120 is ____ 500 and 1250 is ____ 1890 and 420 is ____
1400 and 2100 is ____ 3430 and 13720 is ____ 4410 and 2205 is ____ 3150 and 700 is ____ 252 and 588 is ____
2450 and 1750 is ____ 1080 and 945 is ____ 450 and 360 is ____ 2625 and 3375 is ____ 1764 and 2058 is ____
630 and 945 is ____ 600 and 300 is ____ 336 and 756 is ____ 1750 and 700 is ____ 560 and 420 is ____
980 and 1764 is ____ 1890 and 1575 is ____ 588 and 1568 is ____ 224 and 168 is ____ 13720 and 8575 is ____
1470 and 420 is ____ 1120 and 980 is ____ 4725 and 2100 is ____ 1470 and 5145 is ____ 588 and 1568 is ____
1260 and 700 is ____ 1050 and 1260 is ____ 1764 and 2205 is ____ 1875 and 3125 is ____ 1260 and 1890 is ____
2250 and 3375 is ____ 5880 and 1470 is ____ 2352 and 588 is ____ 2205 and 1470 is ____ 96 and 64 is ____
630 and 1470 is ____ 1960 and 980 is ____ 7000 and 6125 is ____ 720 and 270 is ____ 13720 and 12005 is ____
3150 and 2800 is ____ 3920 and 4410 is ____ 270 and 1080 is ____ 6125 and 4900 is ____ 120 and 96 is ____
1050 and 700 is ____ 360 and 810 is ____ 1701 and 1134 is ____ 2835 and 1890 is ____ 1470 and 2352 is ____
3150 and 2835 is ____ 5145 and 8232 is ____ 756 and 1134 is ____ 882 and 1764 is ____ 270 and 360 is ____
The Lowest Common Multiple (L.C.M.) of:
735 and 96 is ____ 735 and 1152 is ____ 54 and 96 is ____ 196 and 882 is ____ 54 and 2058 is ____
315 and 288 is ____ 735 and 600 is ____ 196 and 192 is ____ 210 and 2240 is ____ 56 and 1008 is ____
135 and 280 is ____ 294 and 896 is ____ 315 and 576 is ____ 140 and 560 is ____ 60 and 320 is ____
196 and 168 is ____ 150 and 120 is ____ 84 and 210 is ____ 126 and 1008 is ____ 84 and 768 is ____
490 and 48 is ____ 54 and 560 is ____ 24 and 378 is ____ 60 and 252 is ____ 525 and 504 is ____
60 and 504 is ____ 350 and 840 is ____ 126 and 1176 is ____ 350 and 36 is ____ 1029 and 1280 is ____
490 and 540 is ____ 196 and 2016 is ____ 1029 and 72 is ____ 210 and 168 is ____ 135 and 1120 is ____
36 and 64 is ____ 225 and 480 is ____ 490 and 1680 is ____ 1225 and 280 is ____ 150 and 84 is ____
90 and 1344 is ____ 490 and 1792 is ____ 210 and 72 is ____ 210 and 1008 is ____ 1050 and 210 is ____
140 and 3584 is ____ 140 and 540 is ____ 210 and 1344 is ____ 36 and 280 is ____ 90 and 48 is ____
490 and 672 is ____ 294 and 160 is ____ 135 and 126 is ____ 135 and 600 is ____ 189 and 672 is ____
84 and 256 is ____ 210 and 768 is ____ 196 and 1050 is ____ 490 and 288 is ____ 60 and 144 is ____
40 and 144 is ____ 490 and 1764 is ____ 1715 and 80 is ____ 140 and 196 is ____ 735 and 504 is ____
36 and 320 is ____ 36 and 375 is ____ 441 and 48 is ____ 490 and 360 is ____ 140 and 1225 is ____
294 and 672 is ____ 24 and 525 is ____ 735 and 192 is ____ 490 and 882 is ____ 350 and 756 is ____

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