4th Grade Midyear Math Review

Front

What is subtraction?

Back

Subtraction is the mathematical operation of finding the difference between two numbers. It is represented by the minus sign (-). For example, in the equation 5 - 3 = 2, 2 is the difference.

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How do you find the total number of items after some are taken away?

Back

To find the total number of items after some are taken away, you subtract the number of items taken from the original total. For example, if you have 10 apples and eat 3, you have 10 - 3 = 7 apples left.

Front

What is division?

Back

Division is the mathematical operation of splitting a number into equal parts. It is represented by the division sign (÷). For example, in the equation 12 ÷ 4 = 3, 3 is the number of equal parts.

Front

How do you calculate the number of weeks needed to save a certain amount of money?

Back

To calculate the number of weeks needed to save a certain amount of money, divide the total amount needed by the amount saved each week. For example, if you need $659 and save $9 each week, you would calculate 659 ÷ 9.

Front

What is a group in mathematics?

Back

A group in mathematics refers to a collection of items or numbers that are considered together. For example, if there are 50 students and 20 are not picked, the remaining students can be grouped for further analysis.

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How do you find the cost of multiple items?

Back

To find the total cost of multiple items, multiply the cost of one item by the number of items. For example, if one ride costs 5 tickets and you want to go on 3 rides, the total cost is 5 x 3 = 15 tickets.

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What does it mean to compare weights?

Back

Comparing weights involves determining how one weight relates to another. For example, if a bag of coal weighs 5 times as much as a bag of candy canes, you can express this relationship mathematically.

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What is a mathematical equation?

Back

A mathematical equation is a statement that two expressions are equal. It often contains variables and constants. For example, 2x + 3 = 7 is an equation where x is a variable.

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How do you solve for a variable in an equation?

Back

To solve for a variable in an equation, you isolate the variable on one side of the equation using inverse operations. For example, in the equation x + 5 = 10, you would subtract 5 from both sides to find x.

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What is the importance of estimation in math?

Back

Estimation is important in math as it allows you to make quick, rough calculations to determine if an answer is reasonable. For example, estimating the total cost of items before calculating the exact amount.