Math Counts Practice 1

Front

What is the least common multiple (LCM)?

Back

The least common multiple (LCM) of two or more numbers is the smallest number that is a multiple of each of the numbers.

Front

How do you find the LCM of 6, 8, and 10?

Back

To find the LCM, list the multiples of each number: Multiples of 6: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60... Multiples of 8: 8, 16, 24, 32, 40, 48, 56, 64... Multiples of 10: 10, 20, 30, 40, 50, 60... The smallest common multiple is 120.

Front

What is a mean in mathematics?

Back

The mean is the average of a set of numbers, calculated by adding all the numbers together and dividing by the count of numbers.

Front

How do you calculate the mean of 1/2 and 7/8?

Back

Convert to a common denominator: 1/2 = 4/8. Mean = (4/8 + 7/8) / 2 = 11/16.

Front

What is a dollar made up of in coins?

Back

A dollar can be made up of different combinations of coins, such as nickels (5 cents) and dimes (10 cents).

Front

If a dollar is changed into 16 coins of nickels and dimes, how do you set up the equation?

Back

Let n = number of nickels and d = number of dimes. Equation 1: n + d = 16 (total coins) Equation 2: 5n + 10d = 100 (total value in cents).

Front

What is the value of 4 dimes and 12 nickels?

Back

4 dimes = 4 x 10 cents = 40 cents. 12 nickels = 12 x 5 cents = 60 cents. Total = 40 + 60 = 100 cents = 1 dollar.

Front

How do you solve for the day of the week given a sequence of days?

Back

Start from the known day and count forward or backward according to the clues given.

Front

If today is Thursday, what day is 6 days after the day before yesterday?

Back

The day before yesterday is Tuesday. 6 days after Tuesday is Monday.

Front

What is the total time David has to get ready if he wakes up at 7:08 and leaves at 7:45?

Back

Total time = 7:45 - 7:08 = 37 minutes. Subtract the time taken to snooze (9.5 minutes) and the time before getting out of bed (23 minutes): 37 - 9.5 - 23 = 4.5 minutes.