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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:
480 and 420 is ____ 700 and 1120 is ____ 1800 and 1350 is ____ 1134 and 567 is ____ 540 and 720 is ____
630 and 504 is ____ 9261 and 8232 is ____ 324 and 288 is ____ 540 and 420 is ____ 3920 and 3430 is ____
1470 and 1176 is ____ 1120 and 280 is ____ 588 and 1568 is ____ 900 and 300 is ____ 2646 and 3969 is ____
1050 and 840 is ____ 16807 and 4802 is ____ 2800 and 3150 is ____ 1764 and 2352 is ____ 252 and 756 is ____
432 and 486 is ____ 336 and 168 is ____ 810 and 630 is ____ 120 and 216 is ____ 1500 and 1000 is ____
2058 and 1764 is ____ 360 and 270 is ____ 1764 and 784 is ____ 756 and 630 is ____ 360 and 300 is ____
2940 and 5880 is ____ 420 and 540 is ____ 1050 and 2450 is ____ 120 and 80 is ____ 450 and 180 is ____
1176 and 1764 is ____ 3150 and 2100 is ____ 980 and 1568 is ____ 1260 and 280 is ____ 2450 and 8575 is ____
405 and 270 is ____ 630 and 504 is ____ 448 and 392 is ____ 2646 and 2352 is ____ 1750 and 700 is ____
980 and 2940 is ____ 3969 and 1323 is ____ 243 and 324 is ____ 200 and 120 is ____ 2800 and 2100 is ____
216 and 252 is ____ 6174 and 3087 is ____ 720 and 270 is ____ 8575 and 3675 is ____ 324 and 216 is ____
1372 and 1568 is ____ 252 and 1008 is ____ 504 and 756 is ____ 2835 and 1575 is ____ 1575 and 1260 is ____
8575 and 2450 is ____ 3675 and 1050 is ____ 2205 and 6615 is ____ 2058 and 1176 is ____ 1350 and 300 is ____
168 and 280 is ____ 1680 and 1470 is ____ 1890 and 1680 is ____ 540 and 270 is ____ 840 and 630 is ____
500 and 2000 is ____ 4410 and 3675 is ____ 630 and 882 is ____ 6860 and 3430 is ____ 2205 and 1470 is ____
The Lowest Common Multiple (L.C.M.) of:
150 and 80 is ____ 686 and 640 is ____ 150 and 384 is ____ 60 and 300 is ____ 150 and 350 is ____
375 and 1260 is ____ 40 and 560 is ____ 294 and 240 is ____ 350 and 72 is ____ 54 and 384 is ____
210 and 128 is ____ 60 and 1680 is ____ 84 and 840 is ____ 250 and 432 is ____ 126 and 144 is ____
294 and 560 is ____ 1225 and 768 is ____ 375 and 480 is ____ 126 and 336 is ____ 210 and 270 is ____
735 and 336 is ____ 875 and 384 is ____ 84 and 1568 is ____ 490 and 768 is ____ 225 and 2240 is ____
294 and 420 is ____ 315 and 56 is ____ 24 and 960 is ____ 140 and 144 is ____ 196 and 72 is ____
210 and 224 is ____ 135 and 72 is ____ 525 and 504 is ____ 210 and 192 is ____ 490 and 980 is ____
294 and 90 is ____ 90 and 250 is ____ 150 and 1440 is ____ 135 and 600 is ____ 735 and 252 is ____
60 and 210 is ____ 225 and 1568 is ____ 350 and 252 is ____ 150 and 735 is ____ 350 and 1176 is ____
225 and 480 is ____ 210 and 200 is ____ 210 and 1000 is ____ 135 and 1960 is ____ 140 and 1440 is ____
225 and 280 is ____ 60 and 1344 is ____ 24 and 294 is ____ 126 and 288 is ____ 1225 and 896 is ____
90 and 1470 is ____ 140 and 420 is ____ 56 and 630 is ____ 210 and 168 is ____ 735 and 80 is ____
210 and 432 is ____ 60 and 1120 is ____ 24 and 3136 is ____ 140 and 378 is ____ 315 and 144 is ____
150 and 294 is ____ 315 and 180 is ____ 875 and 600 is ____ 90 and 1176 is ____ 84 and 144 is ____
40 and 336 is ____ 126 and 1296 is ____ 40 and 400 is ____ 140 and 2352 is ____ 294 and 384 is ____

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