GMAT Math
Terms
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- Whole positive and negative numbers are called what?
- Integers
- Is 0 an Integer?
- Yes
- Describe the number 642 using "digits"
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6 hundreds digits
4 tens digits
2 units digits - List all even numbers between -5 and 5
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-4, -2, 0, 2, 4
Note: 0 is an even number -
Is the result even or odd if:
a. even x even = ?
b. odd x odd = ?
c. even x odd = ? -
a. even
b. odd
c. even -
Is the resule even of odd if:
a. even + even = ?
b. odd + odd = ?
c. even + odd = ? -
a. even
b. even
c. odd -
an integer than can only be divided by itself and and 1 without any remainder is called what?
List examples... -
Prime
Examples: 2, 3, 5, 7, 11, 13 - How can you quickly tell if a number is evenly divisible by 2?
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Check to see if the sum of the digits is divisible by 2. If so, then the number is divisible by 2.
Note: the same is true of 3's. If the sum of digits is evenly divisible by 3 then the number is divisible by 3. - How can you quickly tell if a number is evenly divisible by 4?
- If the number formed by the last two digits is evenly divisible by 4 then the whole number is divisible by 4.
- How can you quickly tell if a number is evenly divisible by 6?
- It must be evenly divisible by BOTH 2 and 3.
- 5/7 + 3/7 = ?
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8/7
Note: If the denominator is the same you just add the numberators and put them over the same denominator. - 1/2 + 2/3 = ?
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7/6
Note: When adding or subtracking fractions with different denominators you must change them to common denominators. In this case 1/2 = 3/6 and 2/3 = 4/6. 3/6 + 4/6 = 7/6 - What is the rule for multiplying fractions?
- multiply the two numerators to get the solution's numberator & multiple the two denominators to get the solution's denominator.
- 2/3 x 6/5 = ?
- 12/15 OR 4/5 (reduced)
- What is the rule for dividing fractions?
- Invert one number and then multiply.
- 2/3 divided by 3/4 = ?
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8/9
Found by inverting 3/4. 2/3 x 4/3 = 2 x 4 / 3 x 3 = 8/9 - If 2 boxes hold a total of 14 shirts, how many shirts are contained in 3 boxes?
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21
This is a proportion test. Setup a proportion equation and solve for x. The proportion equation here is:
2/14 = 3/x. Solve for x. Cross multiply the equation to determine 2x = 42. x therefore is 21. -
How do you solve for x in the following equation?
2/14 = 3/x - Cross multiply and solve for x. X = 21 in this case.