Justin weighed 8 lb 12 oz while he was born. At his two-week check-up, he had gained 8 ounces. What was his weight within pounds and ounces?
There are 16 ounces within a pound. If Justin gains 8 ounces he will be 8 pounds and 20 ounces. The 20 ounces is 1 pound and 4 ounces. Add this to the 8 pounds to obtain 9 pounds and 4 ounces.