They used Roman numerals and an abacus counting device
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I use roman numerals in math
The roman numerals can be only helpful when you learn about quadrants in the 7th grade. That's only one reason that roman numerals are helpful in math.
No, but you can use physics to show students practical applications to the math that they are learning
The math teacher taught the students about prime numbers.
A picture of a Venn diagram is in the related links. They are useful because they help you map out problems such as "If there are 3 students in math, 5 students in science and 6 students in total, how many are in both math and science?" To this, you can use the Venn diagram to reason that since there seem to be 8 students in total if math and science are separate, there must be 2 students in both classes.