5th Grade Math Review

Front

What is the result of multiplying a decimal by 100?

Back

To multiply a decimal by 100, move the decimal point two places to the right. For example, 56.73 x 100 = 5,673.

Front

How do you round a decimal to the nearest tenth?

Back

To round a decimal to the nearest tenth, look at the hundredths place. If it's 5 or more, round up. If it's less than 5, round down. For example, 5.67 rounded to the nearest tenth is 5.7.

Front

What is the process for subtracting mixed numbers?

Back

To subtract mixed numbers, convert them to improper fractions, find a common denominator if necessary, and then subtract. For example, 5 1/4 - 2 1/2 = 2 3/4.

Front

How do you express a number in standard form?

Back

Standard form is a way of writing numbers using digits. For example, (2 x 10) + (4 x 1) + (3 x 0.01) + (6 x 0.001) = 24.036 in standard form.

Front

What is a prime number?

Back

A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. The only even prime number is 2.

Front

What is the value of 5.67 rounded to the nearest whole number?

Back

5.67 rounded to the nearest whole number is 6.

Front

How do you convert a mixed number to an improper fraction?

Back

To convert a mixed number to an improper fraction, multiply the whole number by the denominator, add the numerator, and place that over the original denominator. For example, 2 1/2 = (2*2 + 1)/2 = 5/2.

Front

What is the sum of 1/4 and 1/2?

Back

To add fractions, find a common denominator. 1/4 + 1/2 = 1/4 + 2/4 = 3/4.

Front

What is the difference between a rational and an irrational number?

Back

A rational number can be expressed as a fraction of two integers, while an irrational number cannot be expressed as a simple fraction. Examples: 1/2 is rational; √2 is irrational.

Front

How do you find the area of a rectangle?

Back

The area of a rectangle is found by multiplying its length by its width. Area = length x width.