
David W. answered 07/14/17
Experienced Prof
Your husband, the math genius, should be able to look at a simple chart and conclude that it estimates some of the values instead of listing them exactly. As a math genius, I learned this when my wife estimated values of checks she had written and even rounded the numbers on check stubs to whole dollars [but only I had to balance the checking account]. It’s like inches on one edge of a ruler and centimeters on the opposite edge – they don’t quite line up [note: did you know that NASA lost the $125 million Mars orbiter because a Lockheed Martin engineering team used English units of measurement while the agency's team used the more conventional metric system for a key spacecraft operation?]. Thus, because my first car was a VW, I had to buy a set of metric wrenches to work on it.
So, if you can measure 1 2/3 cups, the easy way to double it is to do that twice.
Now, if 1 cup of water is 8 ounces. That means that 2/3 cup of water is 16/3 ounces, or 5 1/3 ounces [but who can measure 1/3 ounce without using spoons?], so the chart simply says it is 5 ounces. That means that doubling 2/3 of a cup makes 4/3 cups, or 10 2/3 ounces, so now when you use 10 ounces by trusting the chart, you are 2/3 ounce off from 10 [again, requiring the use of spoons if it is to be exact].
Brandy K.
07/14/17

David W.
07/14/17
Brandy K.
07/14/17

David W.
07/14/17
Brandy K.
07/14/17
Brandy K.
07/14/17