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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:
5250 and 7000 is ____ 1260 and 280 is ____ 2450 and 3920 is ____ 3150 and 2100 is ____ 4375 and 6125 is ____
630 and 504 is ____ 1890 and 2835 is ____ 420 and 1050 is ____ 480 and 180 is ____ 840 and 1260 is ____
756 and 1008 is ____ 2646 and 2205 is ____ 2450 and 3920 is ____ 1260 and 1050 is ____ 560 and 280 is ____
1215 and 810 is ____ 2800 and 3150 is ____ 120 and 96 is ____ 243 and 567 is ____ 1701 and 1323 is ____
4410 and 3675 is ____ 630 and 1050 is ____ 1750 and 3150 is ____ 2520 and 1575 is ____ 4410 and 5880 is ____
336 and 252 is ____ 1008 and 630 is ____ 2450 and 3920 is ____ 1050 and 600 is ____ 392 and 168 is ____
540 and 300 is ____ 420 and 1050 is ____ 630 and 252 is ____ 1260 and 1470 is ____ 7350 and 6125 is ____
3430 and 2450 is ____ 96 and 144 is ____ 72 and 144 is ____ 3675 and 3150 is ____ 900 and 400 is ____
1250 and 2000 is ____ 252 and 324 is ____ 1323 and 1764 is ____ 1575 and 2025 is ____ 600 and 750 is ____
48 and 120 is ____ 448 and 392 is ____ 1575 and 630 is ____ 5145 and 3087 is ____ 3500 and 2625 is ____
448 and 392 is ____ 3087 and 8232 is ____ 1260 and 840 is ____ 1890 and 420 is ____ 300 and 750 is ____
2450 and 980 is ____ 4200 and 2100 is ____ 3675 and 2100 is ____ 1680 and 840 is ____ 1680 and 630 is ____
8575 and 4900 is ____ 700 and 1120 is ____ 900 and 450 is ____ 320 and 240 is ____ 360 and 810 is ____
2625 and 7875 is ____ 4410 and 6615 is ____ 4116 and 3430 is ____ 750 and 1050 is ____ 10290 and 8575 is ____
3087 and 2058 is ____ 240 and 300 is ____ 1890 and 2205 is ____ 432 and 486 is ____ 4725 and 1050 is ____
The Lowest Common Multiple (L.C.M.) of:
525 and 252 is ____ 490 and 384 is ____ 135 and 96 is ____ 490 and 420 is ____ 36 and 1920 is ____
350 and 192 is ____ 735 and 144 is ____ 36 and 336 is ____ 375 and 378 is ____ 225 and 270 is ____
140 and 1225 is ____ 84 and 640 is ____ 100 and 420 is ____ 40 and 1470 is ____ 490 and 1344 is ____
490 and 1536 is ____ 189 and 315 is ____ 735 and 294 is ____ 196 and 288 is ____ 350 and 84 is ____
24 and 504 is ____ 196 and 1960 is ____ 150 and 240 is ____ 140 and 960 is ____ 189 and 384 is ____
36 and 420 is ____ 84 and 864 is ____ 60 and 336 is ____ 525 and 240 is ____ 140 and 980 is ____
36 and 490 is ____ 525 and 320 is ____ 84 and 504 is ____ 525 and 3072 is ____ 1225 and 324 is ____
490 and 80 is ____ 196 and 96 is ____ 1225 and 1344 is ____ 140 and 48 is ____ 250 and 720 is ____
490 and 96 is ____ 490 and 288 is ____ 350 and 320 is ____ 294 and 1568 is ____ 60 and 144 is ____
735 and 960 is ____ 56 and 384 is ____ 525 and 960 is ____ 100 and 1029 is ____ 315 and 240 is ____
735 and 2058 is ____ 210 and 672 is ____ 350 and 192 is ____ 84 and 480 is ____ 315 and 1680 is ____
126 and 2016 is ____ 150 and 756 is ____ 189 and 84 is ____ 525 and 512 is ____ 490 and 200 is ____
84 and 1024 is ____ 100 and 315 is ____ 100 and 1200 is ____ 126 and 1260 is ____ 350 and 1960 is ____
225 and 672 is ____ 210 and 112 is ____ 196 and 280 is ____ 1029 and 336 is ____ 60 and 686 is ____
250 and 336 is ____ 210 and 900 is ____ 735 and 2744 is ____ 1225 and 504 is ____ 90 and 768 is ____

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