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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:
252 and 144 is ____ 8575 and 7350 is ____ 2520 and 2835 is ____ 4410 and 2940 is ____ 840 and 1470 is ____
252 and 504 is ____ 3675 and 1050 is ____ 3500 and 4375 is ____ 108 and 288 is ____ 1350 and 1200 is ____
840 and 1680 is ____ 360 and 630 is ____ 750 and 1050 is ____ 1008 and 630 is ____ 900 and 1125 is ____
80 and 360 is ____ 600 and 900 is ____ 1050 and 700 is ____ 630 and 420 is ____ 4116 and 5145 is ____
420 and 1260 is ____ 240 and 420 is ____ 300 and 1200 is ____ 432 and 378 is ____ 3150 and 2450 is ____
1050 and 2450 is ____ 588 and 252 is ____ 588 and 882 is ____ 1050 and 1260 is ____ 420 and 840 is ____
288 and 324 is ____ 630 and 2205 is ____ 560 and 1260 is ____ 1260 and 1050 is ____ 120 and 300 is ____
588 and 336 is ____ 1470 and 3920 is ____ 1000 and 1500 is ____ 448 and 168 is ____ 700 and 2800 is ____
4200 and 3150 is ____ 180 and 480 is ____ 11025 and 9800 is ____ 1050 and 2800 is ____ 300 and 120 is ____
2205 and 1764 is ____ 2100 and 2625 is ____ 3150 and 1750 is ____ 270 and 162 is ____ 588 and 672 is ____
300 and 240 is ____ 2940 and 2450 is ____ 672 and 756 is ____ 450 and 900 is ____ 810 and 270 is ____
6125 and 7350 is ____ 450 and 270 is ____ 108 and 324 is ____ 4410 and 3675 is ____ 504 and 756 is ____
900 and 1200 is ____ 1125 and 750 is ____ 1120 and 1260 is ____ 270 and 945 is ____ 420 and 280 is ____
2058 and 7203 is ____ 300 and 1350 is ____ 1960 and 1470 is ____ 1350 and 450 is ____ 1470 and 1260 is ____
3675 and 4410 is ____ 840 and 700 is ____ 1260 and 1575 is ____ 2520 and 1260 is ____ 1050 and 840 is ____
The Lowest Common Multiple (L.C.M.) of:
210 and 640 is ____ 150 and 320 is ____ 350 and 1344 is ____ 294 and 384 is ____ 525 and 1152 is ____
294 and 672 is ____ 40 and 280 is ____ 54 and 180 is ____ 135 and 2688 is ____ 441 and 120 is ____
490 and 1080 is ____ 210 and 192 is ____ 294 and 240 is ____ 210 and 360 is ____ 40 and 896 is ____
150 and 490 is ____ 525 and 240 is ____ 135 and 720 is ____ 140 and 1568 is ____ 140 and 420 is ____
60 and 384 is ____ 490 and 960 is ____ 225 and 840 is ____ 525 and 504 is ____ 60 and 1680 is ____
54 and 360 is ____ 225 and 672 is ____ 36 and 1152 is ____ 150 and 288 is ____ 60 and 210 is ____
315 and 60 is ____ 36 and 288 is ____ 140 and 240 is ____ 1715 and 1120 is ____ 315 and 256 is ____
315 and 960 is ____ 24 and 216 is ____ 490 and 288 is ____ 210 and 225 is ____ 126 and 256 is ____
84 and 252 is ____ 350 and 180 is ____ 135 and 144 is ____ 490 and 1470 is ____ 350 and 1680 is ____
210 and 144 is ____ 441 and 768 is ____ 135 and 270 is ____ 60 and 168 is ____ 140 and 420 is ____
315 and 640 is ____ 735 and 160 is ____ 90 and 216 is ____ 100 and 252 is ____ 1225 and 480 is ____
36 and 450 is ____ 525 and 384 is ____ 350 and 336 is ____ 90 and 560 is ____ 490 and 294 is ____
60 and 768 is ____ 735 and 441 is ____ 490 and 360 is ____ 350 and 3136 is ____ 140 and 288 is ____
24 and 1372 is ____ 3675 and 735 is ____ 735 and 1008 is ____ 150 and 630 is ____ 210 and 135 is ____
16 and 224 is ____ 40 and 144 is ____ 875 and 840 is ____ 84 and 392 is ____ 54 and 256 is ____

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