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Hröð stærðfræði - tvöfalda þá tölu!

Getur þú tvöfaldað allar þessar tölur innan tímamarka? Prófaðu andlega stærðfræðikunnáttu þína!
Þessi spurningakeppni breytist í hvert skipti sem þú spilar!
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This quiz is in Icelandic
Quiz by Jerry928
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Last updated: September 17, 2023
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First submittedSeptember 17, 2023
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númer
tvöfalt
19
38
546
1092
472
944
478
956
626
1252
númer
tvöfalt
256
512
901
1802
689
1378
81
162
519
1038
númer
tvöfalt
33
66
931
1862
602
1204
389
778
143
286
númer
tvöfalt
688
1376
166
332
989
1978
119
238
792
1584
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