# TACHS Math : Operations

## Example Questions

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### Example Question #9 : Tachs: Math And Ability

Subtract.

Explanation:

In order to solve this problem we must subtract the second number from the first number.

### Example Question #1 : Tachs: Math And Ability

Square 0.44.

Explanation:

To square a number means to multiply it by itself, so we seek to compute

To multiply two decimal fractions, first multiply, ignoring the decimal points:

Move the (implied) decimal point the number of spaces right equal to the total number of digits right of the decimal points in the factors; this can be seen to be four:

The square of 0.44 is 0.1936.

### Example Question #1 : Operations

Tiffany earns  each week. If Mark earns  less than Tiffany, what is the sum of their salaries each week?

Explanation:

Start by finding out how much Mark makes. Since he makes  less than Tiffany, we can write the following to find Mark's weekly salary:

Mark must make  each week. Now, add together their salaries to find the sum.

### Example Question #2 : Operations

Rachel earns  an hour as an assistant in a science lab. How many  hour work weeks will she need to work in order to pay for a car that costs ?

Cannot be determined

Explanation:

Start by figuring out how much Rachel can earn in each week by multiplying her hourly rate by the number of hours worked each week.

Now, divide the amount she needs to earn by the amount earned each week to find how many weeks she will need to work to earn that amount.

Rachel must work for  weeks in order to earn enough for the car.

### Example Question #3 : Decimals

Explanation:

In order to solve this problem we need to line up the decimal places and add.

### Example Question #11 : Tachs: Math And Ability

What is the value of ?

Explanation:

In order to add fractions with different denominators, we will need to change one or both denominators first. Notice that  is a factor of , which means we can multiply the numerator and the denominator of  by  to get .

Now, add the two fractions together as they have the same denominator.

Next, solve .

The least common multiple of  and  is .

Thus,

### Example Question #1 : Operations

Janice's car can travel  miles on one gallon of gas. Her car can normally hold  gallons of gas, but it is only  full. How many miles can Janice travel before the tank is empty?

Explanation:

Start by finding out how many gallons is currently in Janice's tank.

Since it is only  full,

.

The tank only has  gallons in it right now. Multiply this by the number of miles traveled per gallon to find how far Janice can travel before the tank is empty.

### Example Question #1 : Fractions

What is the product of  and ?

Explanation:

Since the question asks for the product, you will need to multiply the two fractions. Recall that in multiplying two fractions, you will multiply the numerators together and then multiply the denominators together.

Next, reduce the fraction.

### Example Question #1 : Operations

What is the difference between  and ?

Explanation:

Since the question asks you to find the difference, you will need to subtract the two fractions:

Start by making both denominators the same. Multiply the numerator and denominator of  by  to get .

Now, subtract.

Make sure to simplify the answer.

### Example Question #12 : Tachs: Math And Ability

Paul can type  words per minute. If Josie can type  faster than Paul can, how many words can Josie type in  minutes?

Cannot be determined