Using a commen denominator to order fractions

How many grams must be adde to 970g to make 1 and a half kg

Whats the name of the vertical axis

The dolphins at the webster are fed 1/2 of a bucket of fish each day the sea otters are fed 1/2 as much fish as the dolphins how many buckets of fish are the sea fed each day? simplify you answer and write it as a proper fraction or as a whole or mixed number