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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:
3675 and 3150 is ____ 2100 and 3675 is ____ 700 and 600 is ____ 1575 and 1050 is ____ 1575 and 1050 is ____
336 and 252 is ____ 1960 and 980 is ____ 1200 and 1050 is ____ 900 and 2025 is ____ 80 and 240 is ____
432 and 216 is ____ 630 and 1260 is ____ 2450 and 4900 is ____ 270 and 720 is ____ 1250 and 3125 is ____
1512 and 756 is ____ 3087 and 2646 is ____ 588 and 1470 is ____ 240 and 200 is ____ 2450 and 3675 is ____
1470 and 2058 is ____ 1050 and 900 is ____ 2450 and 7350 is ____ 108 and 72 is ____ 5880 and 2205 is ____
200 and 160 is ____ 700 and 560 is ____ 1050 and 3150 is ____ 756 and 1134 is ____ 2625 and 1750 is ____
420 and 630 is ____ 2450 and 7350 is ____ 3675 and 4200 is ____ 1470 and 420 is ____ 1250 and 500 is ____
13720 and 12005 is ____ 270 and 432 is ____ 2940 and 2205 is ____ 1134 and 756 is ____ 882 and 1008 is ____
4725 and 4200 is ____ 1470 and 2646 is ____ 588 and 1470 is ____ 630 and 1680 is ____ 168 and 420 is ____
630 and 882 is ____ 2025 and 1350 is ____ 216 and 324 is ____ 216 and 324 is ____ 4200 and 2100 is ____
72 and 108 is ____ 4410 and 2940 is ____ 1890 and 2835 is ____ 504 and 392 is ____ 2940 and 6615 is ____
1050 and 1890 is ____ 3528 and 2646 is ____ 378 and 1134 is ____ 540 and 450 is ____ 336 and 504 is ____
980 and 784 is ____ 480 and 420 is ____ 200 and 600 is ____ 2625 and 1050 is ____ 480 and 120 is ____
675 and 1350 is ____ 300 and 240 is ____ 378 and 630 is ____ 810 and 720 is ____ 2625 and 2100 is ____
4116 and 6174 is ____ 900 and 600 is ____ 2940 and 4410 is ____ 1350 and 1575 is ____ 300 and 1050 is ____
The Lowest Common Multiple (L.C.M.) of:
441 and 252 is ____ 294 and 150 is ____ 350 and 1280 is ____ 490 and 240 is ____ 2401 and 1920 is ____
135 and 640 is ____ 735 and 480 is ____ 150 and 210 is ____ 100 and 336 is ____ 294 and 240 is ____
350 and 432 is ____ 40 and 144 is ____ 1715 and 784 is ____ 196 and 735 is ____ 56 and 210 is ____
735 and 180 is ____ 135 and 420 is ____ 350 and 288 is ____ 210 and 336 is ____ 56 and 504 is ____
1029 and 200 is ____ 196 and 200 is ____ 140 and 1536 is ____ 24 and 96 is ____ 126 and 750 is ____
210 and 360 is ____ 225 and 1600 is ____ 350 and 1512 is ____ 189 and 140 is ____ 90 and 840 is ____
140 and 640 is ____ 40 and 840 is ____ 525 and 270 is ____ 735 and 1200 is ____ 490 and 126 is ____
150 and 240 is ____ 210 and 672 is ____ 40 and 1470 is ____ 189 and 1568 is ____ 210 and 2352 is ____
210 and 672 is ____ 686 and 960 is ____ 315 and 60 is ____ 525 and 504 is ____ 150 and 96 is ____
16 and 96 is ____ 100 and 432 is ____ 525 and 1920 is ____ 84 and 250 is ____ 135 and 108 is ____
210 and 288 is ____ 210 and 735 is ____ 210 and 315 is ____ 525 and 672 is ____ 210 and 980 is ____
24 and 288 is ____ 90 and 288 is ____ 210 and 288 is ____ 250 and 504 is ____ 210 and 378 is ____
1029 and 560 is ____ 90 and 320 is ____ 315 and 392 is ____ 1225 and 1120 is ____ 126 and 640 is ____
735 and 980 is ____ 350 and 480 is ____ 56 and 96 is ____ 315 and 360 is ____ 210 and 96 is ____
350 and 2016 is ____ 525 and 1440 is ____ 135 and 256 is ____ 294 and 750 is ____ 126 and 288 is ____

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