Revision

Front

What is the rule for rounding numbers to three decimal places?

Back

To round a number to three decimal places, look at the fourth decimal place. If it is 5 or greater, increase the third decimal place by 1. If it is less than 5, keep the third decimal place the same.

Front

How do you calculate the remaining quantity after taking some out?

Back

To find the remaining quantity, subtract the number taken out from the original quantity. For example, if there are 15 books and 5 are taken out, the calculation is 15 - 5 = 10.

Front

Solve for x: x - 10 = 30

Back

x = 40. To solve for x, add 10 to both sides of the equation.

Front

What is the result of simplifying 625 ÷ 25?

Back

The result is 25. To simplify, divide 625 by 25.

Front

How do you express a number to three significant figures?

Back

To express a number to three significant figures, identify the first three non-zero digits and round the number accordingly. For example, 5.28571 rounded to three significant figures is 5.29.

Front

What is the definition of significant figures?

Back

Significant figures are the digits in a number that contribute to its precision. This includes all non-zero digits, any zeros between significant digits, and trailing zeros in the decimal portion.

Front

What is the process for solving linear equations?

Back

To solve linear equations, isolate the variable on one side of the equation using inverse operations (addition, subtraction, multiplication, division) until the variable is alone.

Front

What does it mean to simplify a mathematical expression?

Back

To simplify a mathematical expression means to reduce it to its simplest form, combining like terms and performing operations to make it easier to understand or calculate.

Front

What is the importance of rounding in mathematics?

Back

Rounding is important in mathematics to make numbers easier to work with and to express them in a more manageable form, especially in calculations involving measurements.

Front

How do you determine the number of books left in a box after some are taken out?

Back

Subtract the number of books taken out from the total number of books in the box.