SBAC Review Math Fractions, powers of ten, place value

A fraction represents a part of a whole, expressed as a numerator (top number) over a denominator (bottom number). For example, 1/2 means one part out of two equal parts.

Place value is the value of a digit based on its position in a number. For example, in the number 345, the 3 is in the hundreds place, the 4 is in the tens place, and the 5 is in the ones place.

10^3 means 10 multiplied by itself three times, which equals 1,000.

To add fractions with different denominators, first find a common denominator, convert the fractions, and then add the numerators.

The sum of 5 and 7 is 12.

12 times 10 equals 120.

'Reasonable' means that the estimate is logical and makes sense based on the numbers involved.

The digit 5 is in the hundreds place, so its value is 500.

27 x 10^3 equals 27,000.

Addition and subtraction are inverse operations; adding a number and then subtracting the same number returns you to the original number.