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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:
2625 and 4375 is ____ 720 and 270 is ____ 280 and 1120 is ____ 630 and 840 is ____ 3150 and 1050 is ____
112 and 336 is ____ 168 and 48 is ____ 3528 and 1323 is ____ 3375 and 750 is ____ 1750 and 3150 is ____
4410 and 3920 is ____ 4410 and 2940 is ____ 300 and 240 is ____ 2025 and 450 is ____ 1470 and 6615 is ____
4410 and 3920 is ____ 900 and 1050 is ____ 3150 and 4725 is ____ 630 and 1050 is ____ 588 and 392 is ____
700 and 2800 is ____ 2100 and 1575 is ____ 588 and 336 is ____ 7203 and 4116 is ____ 5250 and 7875 is ____
900 and 800 is ____ 2940 and 2205 is ____ 1050 and 750 is ____ 2450 and 6125 is ____ 4200 and 2100 is ____
420 and 588 is ____ 72 and 216 is ____ 360 and 810 is ____ 3150 and 2100 is ____ 1050 and 840 is ____
162 and 270 is ____ 2940 and 2450 is ____ 700 and 200 is ____ 840 and 1260 is ____ 200 and 800 is ____
840 and 756 is ____ 270 and 324 is ____ 840 and 1260 is ____ 567 and 945 is ____ 420 and 1050 is ____
336 and 756 is ____ 2058 and 1764 is ____ 324 and 180 is ____ 2835 and 1260 is ____ 1400 and 2800 is ____
630 and 840 is ____ 1680 and 1470 is ____ 2625 and 4375 is ____ 112 and 392 is ____ 600 and 750 is ____
588 and 420 is ____ 750 and 2000 is ____ 945 and 1215 is ____ 280 and 840 is ____ 1470 and 5880 is ____
240 and 280 is ____ 4410 and 2940 is ____ 700 and 840 is ____ 450 and 180 is ____ 4116 and 3430 is ____
3675 and 4200 is ____ 10290 and 9261 is ____ 2205 and 3087 is ____ 4725 and 2625 is ____ 360 and 300 is ____
1470 and 588 is ____ 3675 and 4725 is ____ 504 and 336 is ____ 1500 and 1125 is ____ 1470 and 1176 is ____
The Lowest Common Multiple (L.C.M.) of:
60 and 300 is ____ 210 and 196 is ____ 150 and 480 is ____ 350 and 1344 is ____ 40 and 100 is ____
350 and 672 is ____ 24 and 480 is ____ 375 and 1344 is ____ 210 and 672 is ____ 315 and 840 is ____
315 and 288 is ____ 135 and 448 is ____ 140 and 120 is ____ 1715 and 1764 is ____ 350 and 180 is ____
490 and 630 is ____ 525 and 420 is ____ 196 and 108 is ____ 210 and 160 is ____ 56 and 224 is ____
40 and 768 is ____ 84 and 480 is ____ 16 and 576 is ____ 250 and 200 is ____ 525 and 240 is ____
875 and 720 is ____ 225 and 320 is ____ 490 and 168 is ____ 250 and 588 is ____ 525 and 1008 is ____
250 and 112 is ____ 90 and 144 is ____ 210 and 240 is ____ 100 and 288 is ____ 875 and 200 is ____
84 and 210 is ____ 350 and 360 is ____ 60 and 216 is ____ 525 and 588 is ____ 36 and 336 is ____
315 and 1176 is ____ 1029 and 210 is ____ 84 and 648 is ____ 525 and 360 is ____ 525 and 420 is ____
735 and 210 is ____ 100 and 180 is ____ 375 and 294 is ____ 1225 and 240 is ____ 375 and 240 is ____
1029 and 504 is ____ 196 and 1200 is ____ 490 and 1344 is ____ 36 and 392 is ____ 196 and 135 is ____
525 and 875 is ____ 490 and 224 is ____ 90 and 1280 is ____ 210 and 1260 is ____ 735 and 112 is ____
210 and 504 is ____ 294 and 840 is ____ 210 and 1536 is ____ 490 and 384 is ____ 294 and 384 is ____
1029 and 588 is ____ 210 and 720 is ____ 210 and 120 is ____ 24 and 896 is ____ 210 and 448 is ____
135 and 735 is ____ 90 and 280 is ____ 60 and 720 is ____ 90 and 192 is ____ 225 and 336 is ____

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