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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:
1960 and 3430 is ____ 540 and 675 is ____ 420 and 300 is ____ 144 and 96 is ____ 700 and 300 is ____
252 and 168 is ____ 1134 and 630 is ____ 2100 and 1750 is ____ 72 and 168 is ____ 300 and 480 is ____
300 and 240 is ____ 1680 and 630 is ____ 560 and 1260 is ____ 2450 and 2800 is ____ 1350 and 900 is ____
840 and 700 is ____ 1350 and 1200 is ____ 180 and 300 is ____ 420 and 280 is ____ 672 and 588 is ____
1890 and 1470 is ____ 1890 and 630 is ____ 1008 and 1134 is ____ 540 and 450 is ____ 6615 and 1470 is ____
3430 and 1470 is ____ 980 and 1260 is ____ 3675 and 4200 is ____ 450 and 1800 is ____ 1260 and 1050 is ____
168 and 504 is ____ 3430 and 3920 is ____ 1176 and 2058 is ____ 1260 and 700 is ____ 1350 and 600 is ____
900 and 1200 is ____ 980 and 560 is ____ 980 and 420 is ____ 1680 and 420 is ____ 1250 and 500 is ____
3920 and 1470 is ____ 1750 and 2100 is ____ 9800 and 11025 is ____ 288 and 180 is ____ 378 and 432 is ____
216 and 144 is ____ 1050 and 4200 is ____ 3675 and 2100 is ____ 300 and 420 is ____ 588 and 672 is ____
630 and 1470 is ____ 1470 and 1176 is ____ 810 and 1080 is ____ 324 and 432 is ____ 144 and 72 is ____
360 and 240 is ____ 5145 and 3430 is ____ 1050 and 1750 is ____ 630 and 840 is ____ 1890 and 630 is ____
2205 and 5880 is ____ 1470 and 420 is ____ 3675 and 2450 is ____ 700 and 900 is ____ 3150 and 2800 is ____
1764 and 2352 is ____ 2450 and 8575 is ____ 2450 and 11025 is ____ 3675 and 2100 is ____ 300 and 420 is ____
7203 and 9604 is ____ 2625 and 3000 is ____ 630 and 1050 is ____ 4410 and 1470 is ____ 1764 and 1176 is ____
The Lowest Common Multiple (L.C.M.) of:
735 and 168 is ____ 350 and 490 is ____ 126 and 2560 is ____ 1225 and 1536 is ____ 350 and 1176 is ____
1029 and 294 is ____ 60 and 189 is ____ 490 and 336 is ____ 84 and 1400 is ____ 54 and 1225 is ____
210 and 288 is ____ 36 and 168 is ____ 294 and 504 is ____ 40 and 1372 is ____ 250 and 630 is ____
150 and 441 is ____ 56 and 189 is ____ 84 and 144 is ____ 294 and 252 is ____ 294 and 210 is ____
441 and 1008 is ____ 210 and 196 is ____ 250 and 1470 is ____ 210 and 840 is ____ 686 and 180 is ____
210 and 192 is ____ 189 and 756 is ____ 490 and 192 is ____ 315 and 1152 is ____ 1715 and 144 is ____
441 and 288 is ____ 140 and 240 is ____ 56 and 144 is ____ 81 and 480 is ____ 350 and 384 is ____
294 and 2352 is ____ 1225 and 2401 is ____ 196 and 840 is ____ 126 and 2016 is ____ 350 and 588 is ____
60 and 640 is ____ 525 and 1176 is ____ 135 and 324 is ____ 875 and 600 is ____ 126 and 216 is ____
126 and 336 is ____ 441 and 360 is ____ 54 and 1470 is ____ 294 and 1000 is ____ 90 and 1680 is ____
735 and 216 is ____ 315 and 140 is ____ 90 and 1200 is ____ 36 and 630 is ____ 150 and 240 is ____
875 and 108 is ____ 60 and 192 is ____ 189 and 1008 is ____ 100 and 480 is ____ 350 and 960 is ____
150 and 288 is ____ 375 and 240 is ____ 350 and 96 is ____ 210 and 84 is ____ 294 and 288 is ____
315 and 168 is ____ 135 and 1260 is ____ 315 and 375 is ____ 210 and 1008 is ____ 90 and 1600 is ____
60 and 432 is ____ 315 and 576 is ____ 210 and 504 is ____ 24 and 315 is ____ 24 and 560 is ____

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