QA Review

Front

What is expanded notation?

Back

Expanded notation is a way to write numbers that shows the value of each digit. For example, 19.34 can be written as (1 x 10) + (9 x 1) + (3 x 0.1) + (4 x 0.01).

Front

How do you estimate the difference between two decimal numbers?

Back

To estimate the difference, round each number to the nearest whole number or tenth, then subtract. For example, for 293.6 and 205.2, round to 294 and 205, then subtract: 294 - 205 = 89.

Front

What does the symbol '>' mean in mathematics?

Back

The symbol '>' means 'greater than'. For example, 34.5 > 34.25 means 34.5 is greater than 34.25.

Front

How do you find a number that is between two other numbers?

Back

To find a number between two numbers, look for a value that is greater than the smaller number and less than the larger number. For example, between 34.25 and 34.5, 34.36 is a valid number.

Front

What is the process to subtract decimals?

Back

To subtract decimals, align the numbers by the decimal point, subtract as you would with whole numbers, and place the decimal point in the answer.

Front

What is the value of the expression 3(6 x 6) - 15?

Back

First, calculate inside the parentheses: 6 x 6 = 36. Then multiply by 3: 3 x 36 = 108. Finally, subtract 15: 108 - 15 = 93.

Front

What is the value of 1.456 + 3.371?

Back

1.456 + 3.371 = 4.827.

Front

How do you calculate the remaining amount after using a part of it?

Back

To find the remaining amount, subtract the used amount from the total amount. For example, if you start with 7 meters and use 3.371 and 1.456, the remaining is 7 - (3.371 + 1.456) = 2.173.

Front

What is a decimal number?

Back

A decimal number is a number that includes a decimal point, which separates the whole number part from the fractional part. For example, 19.34.

Front

How do you compare two decimal numbers?

Back

To compare two decimal numbers, look at the digits from left to right, starting with the highest place value. The first digit that differs determines which number is greater.