Final answer:
To determine how many groups of 15 are in 150 when using the partial quotients method for division, simply divide 150 by 15, which results in 10 groups of 15.
Step-by-step explanation:
When solving 1398 divided by 15 using partial quotients, and you start by subtracting 150 from 1399, we want to find out how many groups of 15 are in 150. To find the number of groups, you divide 150 by 15. Doing the math:
150 ÷ 15 = 10
So, there are 10 groups of 15 in 150. This method can be helpful in simplifying the division problem into smaller, more manageable chunks, which is particularly useful in the partial quotients method of division.