Which of the following numbers should replace the missing denominator in order to add the fractions? 25/82 + 13/?
1. 82
2. 13
3. 25
4. 28
25//82 +13/82 = 38 / 82 = 19/41
Ummmhhh, you need a "common" denominator, so 82
The bot misses another obvious one!