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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:
1750 and 700 is ____ 1960 and 980 is ____ 810 and 675 is ____ 180 and 144 is ____ 360 and 420 is ____
1050 and 2625 is ____ 540 and 810 is ____ 1323 and 3087 is ____ 3920 and 2450 is ____ 1134 and 945 is ____
3675 and 11025 is ____ 3675 and 2205 is ____ 96 and 216 is ____ 900 and 450 is ____ 756 and 672 is ____
3969 and 2205 is ____ 1050 and 1680 is ____ 400 and 900 is ____ 2058 and 1764 is ____ 504 and 448 is ____
9800 and 2450 is ____ 810 and 360 is ____ 588 and 420 is ____ 560 and 980 is ____ 240 and 120 is ____
3500 and 7875 is ____ 2058 and 1470 is ____ 3675 and 2625 is ____ 378 and 882 is ____ 2100 and 700 is ____
240 and 200 is ____ 1575 and 2025 is ____ 1372 and 1764 is ____ 3920 and 4410 is ____ 2450 and 2100 is ____
252 and 324 is ____ 1260 and 2205 is ____ 240 and 540 is ____ 144 and 72 is ____ 1680 and 1470 is ____
1050 and 2625 is ____ 1470 and 420 is ____ 2205 and 1260 is ____ 5488 and 4802 is ____ 3675 and 3150 is ____
700 and 2800 is ____ 5145 and 13720 is ____ 420 and 1470 is ____ 980 and 1372 is ____ 378 and 630 is ____
224 and 168 is ____ 2800 and 3150 is ____ 540 and 810 is ____ 448 and 392 is ____ 1575 and 1050 is ____
1680 and 420 is ____ 630 and 420 is ____ 2835 and 630 is ____ 810 and 360 is ____ 1575 and 2100 is ____
2100 and 3150 is ____ 4410 and 3675 is ____ 3969 and 2205 is ____ 336 and 756 is ____ 2450 and 1960 is ____
1050 and 840 is ____ 900 and 1200 is ____ 112 and 96 is ____ 216 and 120 is ____ 450 and 630 is ____
5488 and 6174 is ____ 5250 and 3500 is ____ 240 and 300 is ____ 3150 and 2625 is ____ 168 and 216 is ____
The Lowest Common Multiple (L.C.M.) of:
735 and 960 is ____ 210 and 126 is ____ 210 and 1792 is ____ 490 and 840 is ____ 350 and 1372 is ____
525 and 960 is ____ 84 and 240 is ____ 315 and 960 is ____ 54 and 588 is ____ 315 and 672 is ____
350 and 1008 is ____ 525 and 672 is ____ 189 and 1568 is ____ 525 and 192 is ____ 140 and 294 is ____
294 and 420 is ____ 735 and 140 is ____ 126 and 1260 is ____ 40 and 360 is ____ 100 and 768 is ____
210 and 1152 is ____ 100 and 270 is ____ 525 and 192 is ____ 686 and 504 is ____ 126 and 300 is ____
100 and 80 is ____ 441 and 1440 is ____ 490 and 360 is ____ 490 and 588 is ____ 294 and 180 is ____
140 and 840 is ____ 24 and 480 is ____ 441 and 2304 is ____ 210 and 140 is ____ 100 and 240 is ____
735 and 900 is ____ 1029 and 560 is ____ 210 and 2352 is ____ 150 and 210 is ____ 100 and 378 is ____
250 and 896 is ____ 210 and 480 is ____ 490 and 432 is ____ 196 and 192 is ____ 60 and 480 is ____
135 and 384 is ____ 24 and 300 is ____ 150 and 450 is ____ 686 and 1050 is ____ 525 and 320 is ____
315 and 448 is ____ 126 and 1120 is ____ 490 and 768 is ____ 135 and 1344 is ____ 250 and 480 is ____
1029 and 960 is ____ 84 and 432 is ____ 735 and 189 is ____ 735 and 840 is ____ 36 and 700 is ____
294 and 180 is ____ 350 and 72 is ____ 210 and 320 is ____ 84 and 252 is ____ 525 and 1080 is ____
490 and 600 is ____ 60 and 576 is ____ 150 and 360 is ____ 210 and 48 is ____ 196 and 54 is ____
350 and 800 is ____ 490 and 192 is ____ 735 and 196 is ____ 84 and 384 is ____ 525 and 512 is ____

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