Mathematic

Adding Positive and Negative Integers If one of the integers is negative, subtract the absolute value of it from the other number. Example: 14 +…

Addition Equations To solve an equation means to find a value for the variable that makes the equation true. Whatever you do to one side…

Four Basic Operations of Mathematics: Addition, Subtraction, Multiplication and Division The practice section of this page contains addition, subtraction, multiplication and division problems. Refer to the…

Place Values – Expanded Form Bundling objects into sets of 10 (then 10 tens into one hundred, and 10 hundreds into one thousand, etc.) is…

Estimate the sum of decimals To estimate means to find an answer that is close to but not exact. It is a reasonable answer to…

Improving an Estimate of a sum by rounding Estimation usually requires rounding. When you round a number, you find a new number that’s close to…

Addition of Minutes and Seconds In general, summing or subtracting time will get the time format such as hh:mm:ss, but in some cases, you just…

Changing Hours and Minutes to Seconds Add or Subtract the hours and minutes separately. But you may need to do some adjusting if the minutes…

Adding Pounds and Ounces Add the ounces together. If the number of ounces is greater than 16, divide the ounces by 16. The quotient is…

Subtracting Feet and Inches Handles operations for feet whole numbers and inches in mixed numbers for adding, subtracting, dividing or multiplying whole numbers, fractions or…

Addition of Decimals Decimals are fractional numbers. The decimal 0.3 is the same as the fraction 3/10. The number 0.78 is a decimal that represents…

Multiplying by Repeated Addition Multiplication is defined as meaning that you have a certain number of groups of the same size. Then, it can be…