Decimal and integer operations review
Sure! Let's start with decimal operations.
Decimal Operations:
1. Addition: To add decimal numbers, align the decimal points and add the digits as you would with whole numbers. Remember to carry over any extra digits from the right side of the decimal point. For example: 2.4 + 1.6 = 4.0.
2. Subtraction: Similar to addition, align the decimal points and subtract the digits as you would with whole numbers. Borrow as needed, just like in regular subtraction. For example: 6.3 - 2.1 = 4.2.
3. Multiplication: Multiply decimal numbers just like you would with whole numbers, ignoring the decimal points. Then, count the total number of decimal places in both numbers and place the decimal point in the answer that many places from the right. For example: 2.5 * 1.2 = 3.0.
4. Division: Divide decimal numbers as you would with whole numbers. Count the total number of decimal places in the dividend and divisor, then move the decimal point in the dividend to the right to make it a whole number. Move the decimal point in the divisor the same number of places. Perform the division, and place the decimal point in the quotient directly above the decimal point in the dividend. For example: 4.8 ÷ 1.2 = 4.0.
Now, let's move on to integer operations.
Integer Operations:
1. Addition: To add integers, simply add the numbers together. If the signs are the same, add the absolute values and keep the sign. If the signs are different, subtract the absolute values and keep the sign of the number with the larger absolute value. For example: (-5) + 3 = -2.
2. Subtraction: Subtracting integers is similar to addition. If the signs are the same, subtract the absolute values and keep the sign. If the signs are different, add the absolute values and keep the sign of the number with the larger absolute value. For example: 8 - (-2) = 10.
3. Multiplication: Multiply integers just like you would with whole numbers. If the signs are the same, the product is positive. If the signs are different, the product is negative. For example: (-3) * (-4) = 12.
4. Division: Divide integers as you would with whole numbers. If the signs are the same, the quotient is positive. If the signs are different, the quotient is negative. For example: (-20) ÷ 5 = -4.
I hope this review helps! Let me know if there's anything else I can explain or clarify.