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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:
15435 and 10290 is ____ 280 and 1120 is ____ 2450 and 1400 is ____ 1260 and 1680 is ____ 1250 and 1000 is ____
1470 and 980 is ____ 14406 and 4802 is ____ 700 and 600 is ____ 2800 and 2450 is ____ 1875 and 1250 is ____
2940 and 5880 is ____ 3150 and 4200 is ____ 108 and 144 is ____ 750 and 1750 is ____ 4725 and 4200 is ____
945 and 2835 is ____ 1050 and 300 is ____ 2100 and 3150 is ____ 1764 and 588 is ____ 800 and 700 is ____
180 and 240 is ____ 1750 and 7875 is ____ 2025 and 1800 is ____ 720 and 450 is ____ 1008 and 378 is ____
5145 and 6615 is ____ 840 and 1260 is ____ 600 and 540 is ____ 540 and 120 is ____ 180 and 810 is ____
1260 and 420 is ____ 540 and 180 is ____ 900 and 810 is ____ 6125 and 3500 is ____ 980 and 4410 is ____
3675 and 8575 is ____ 2940 and 5145 is ____ 1701 and 567 is ____ 3750 and 3375 is ____ 1750 and 6125 is ____
675 and 945 is ____ 72 and 144 is ____ 2205 and 1470 is ____ 1750 and 1400 is ____ 1701 and 1512 is ____
945 and 2835 is ____ 108 and 270 is ____ 756 and 630 is ____ 1372 and 5488 is ____ 840 and 980 is ____
504 and 420 is ____ 3087 and 1764 is ____ 1176 and 588 is ____ 360 and 240 is ____ 1750 and 2800 is ____
162 and 108 is ____ 2000 and 1750 is ____ 1200 and 1350 is ____ 4410 and 1960 is ____ 630 and 1260 is ____
3528 and 3087 is ____ 160 and 240 is ____ 675 and 2025 is ____ 1575 and 1125 is ____ 1323 and 2646 is ____
882 and 2646 is ____ 2800 and 1050 is ____ 1050 and 600 is ____ 1050 and 600 is ____ 11025 and 9800 is ____
945 and 2520 is ____ 784 and 588 is ____ 144 and 168 is ____ 420 and 672 is ____ 2205 and 1470 is ____
The Lowest Common Multiple (L.C.M.) of:
225 and 252 is ____ 210 and 1120 is ____ 150 and 735 is ____ 225 and 1008 is ____ 350 and 180 is ____
60 and 576 is ____ 60 and 1344 is ____ 225 and 128 is ____ 24 and 168 is ____ 1225 and 120 is ____
525 and 700 is ____ 135 and 1568 is ____ 600 and 150 is ____ 210 and 294 is ____ 36 and 432 is ____
140 and 250 is ____ 210 and 288 is ____ 735 and 1344 is ____ 24 and 1152 is ____ 735 and 2058 is ____
210 and 540 is ____ 210 and 448 is ____ 40 and 1120 is ____ 441 and 560 is ____ 294 and 288 is ____
315 and 378 is ____ 625 and 840 is ____ 490 and 1920 is ____ 126 and 192 is ____ 525 and 630 is ____
100 and 1280 is ____ 54 and 120 is ____ 490 and 448 is ____ 1029 and 560 is ____ 135 and 1792 is ____
126 and 120 is ____ 735 and 1008 is ____ 210 and 400 is ____ 84 and 700 is ____ 150 and 108 is ____
140 and 288 is ____ 210 and 336 is ____ 90 and 768 is ____ 441 and 288 is ____ 60 and 120 is ____
294 and 600 is ____ 294 and 896 is ____ 210 and 784 is ____ 225 and 2304 is ____ 60 and 36 is ____
150 and 840 is ____ 225 and 60 is ____ 140 and 135 is ____ 250 and 144 is ____ 140 and 960 is ____
350 and 72 is ____ 100 and 3072 is ____ 210 and 1400 is ____ 140 and 200 is ____ 36 and 180 is ____
126 and 288 is ____ 210 and 392 is ____ 210 and 36 is ____ 1029 and 1440 is ____ 1029 and 1050 is ____
250 and 840 is ____ 350 and 576 is ____ 140 and 300 is ____ 84 and 480 is ____ 54 and 384 is ____
60 and 300 is ____ 294 and 432 is ____ 441 and 960 is ____ 350 and 240 is ____ 294 and 240 is ____

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