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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:
1260 and 1050 is ____ 1680 and 630 is ____ 3675 and 6125 is ____ 784 and 1568 is ____ 360 and 810 is ____
588 and 1568 is ____ 1470 and 3920 is ____ 4802 and 21609 is ____ 3675 and 1470 is ____ 4375 and 3500 is ____
750 and 2000 is ____ 630 and 1890 is ____ 1200 and 1350 is ____ 324 and 162 is ____ 420 and 1890 is ____
1470 and 1680 is ____ 1260 and 945 is ____ 882 and 1176 is ____ 3430 and 2940 is ____ 300 and 1350 is ____
12005 and 8575 is ____ 750 and 2250 is ____ 2940 and 2646 is ____ 630 and 420 is ____ 360 and 120 is ____
882 and 1323 is ____ 1400 and 1260 is ____ 3920 and 2940 is ____ 588 and 672 is ____ 1764 and 1470 is ____
1890 and 1260 is ____ 3675 and 2625 is ____ 3920 and 2450 is ____ 1890 and 1680 is ____ 1890 and 1575 is ____
3675 and 2940 is ____ 504 and 630 is ____ 1470 and 882 is ____ 1470 and 4410 is ____ 180 and 360 is ____
420 and 588 is ____ 2625 and 2250 is ____ 2058 and 9261 is ____ 980 and 2450 is ____ 432 and 216 is ____
756 and 672 is ____ 2352 and 2058 is ____ 540 and 270 is ____ 168 and 252 is ____ 2940 and 4410 is ____
1500 and 3000 is ____ 1050 and 600 is ____ 504 and 392 is ____ 1890 and 630 is ____ 1260 and 1575 is ____
1008 and 756 is ____ 450 and 1050 is ____ 162 and 108 is ____ 1500 and 1125 is ____ 108 and 324 is ____
6615 and 2205 is ____ 1500 and 3000 is ____ 1960 and 3430 is ____ 3375 and 750 is ____ 80 and 240 is ____
945 and 378 is ____ 675 and 1575 is ____ 180 and 252 is ____ 1400 and 1050 is ____ 1260 and 2520 is ____
1470 and 2940 is ____ 2100 and 4200 is ____ 1400 and 2800 is ____ 504 and 280 is ____ 900 and 500 is ____
The Lowest Common Multiple (L.C.M.) of:
490 and 192 is ____ 210 and 784 is ____ 84 and 2352 is ____ 525 and 2744 is ____ 60 and 882 is ____
1225 and 2744 is ____ 490 and 252 is ____ 84 and 1176 is ____ 294 and 1344 is ____ 735 and 336 is ____
350 and 1176 is ____ 84 and 144 is ____ 126 and 192 is ____ 294 and 256 is ____ 250 and 1024 is ____
250 and 768 is ____ 40 and 294 is ____ 84 and 560 is ____ 126 and 280 is ____ 294 and 392 is ____
350 and 168 is ____ 126 and 72 is ____ 60 and 672 is ____ 441 and 896 is ____ 350 and 480 is ____
54 and 288 is ____ 196 and 600 is ____ 60 and 2016 is ____ 735 and 360 is ____ 225 and 448 is ____
196 and 36 is ____ 210 and 1728 is ____ 2401 and 32 is ____ 210 and 392 is ____ 84 and 576 is ____
126 and 756 is ____ 100 and 882 is ____ 490 and 480 is ____ 735 and 1960 is ____ 90 and 1200 is ____
100 and 256 is ____ 140 and 480 is ____ 441 and 1050 is ____ 40 and 1400 is ____ 60 and 252 is ____
490 and 2016 is ____ 40 and 504 is ____ 150 and 720 is ____ 210 and 2240 is ____ 140 and 375 is ____
150 and 640 is ____ 350 and 2240 is ____ 210 and 750 is ____ 140 and 384 is ____ 625 and 288 is ____
84 and 200 is ____ 210 and 432 is ____ 84 and 672 is ____ 1225 and 288 is ____ 294 and 192 is ____
135 and 490 is ____ 60 and 720 is ____ 315 and 1280 is ____ 525 and 160 is ____ 150 and 2688 is ____
140 and 480 is ____ 84 and 1120 is ____ 735 and 108 is ____ 441 and 1176 is ____ 54 and 1024 is ____
210 and 168 is ____ 686 and 420 is ____ 84 and 630 is ____ 140 and 882 is ____ 375 and 756 is ____

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