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When adding and subtracting fractions the denominators must be?

1. How do we add or subtract fractions? The names of what we are adding or subtracting — the denominators — must be the same. Add or subtract only the numerators, and keep that same denominator.

When adding and subtracting fractions all answer must be expressed in the?

To add or subtract fractions, they must have a common denominator. To add or subtract fractions, add or subtract the numerators and place the result over the common denominator.

Do you add denominators when adding fractions?

If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To add fractions with unlike denominators, rename the fractions with a common denominator. Then add and simplify.

How do you add fractions with the same denominators?

Instructions for adding fractions with the same denominator

  1. Build each fraction (if needed) so that both denominators are equal.
  2. Add the numerators of the fractions.
  3. The new denominator will be the denominator of the built-up fractions.
  4. Reduce or simplify your answer, if needed. Factor the numerator.

When subtracting fractions with different denominators What is the first step?

How to subtract fractions with different denominators

  1. Step 1: Find the least common denominator. Find the least common denominator (LCD) of the fractions.
  2. Step 2: Find the equivalent fraction. Find the equivalent fraction of each fraction, so that they all have the LCD as the denominator.
  3. Step 3: Subtract the new numerators.
  4. Step 4: Simplify if necessary.

What is the trick to subtracting fractions?

Subtract fractions with the easy method Here’s the easy way to subtract fractions that have different denominators: Cross-multiply the two fractions and subtract the second number from the first to get the numerator of the answer. After you cross-multiply, be sure to subtract in the correct order.

How do you find the lowest common multiple?

One way to find the least common multiple of two numbers is to first list the prime factors of each number. Then multiply each factor the greatest number of times it occurs in either number. If the same factor occurs more than once in both numbers, you multiply the factor the greatest number of times it occurs.

What are the first 3 multiples of 5?

The first few multiples of 5 are 5, 10, 15, 20, 25, 30, and so on. We get successive multiples of 5 by skip counting. If we skip count 108 times by 5, we will get the 108 th multiple of 5, i.e., 108 × 5 = 540. We can also find the multiples of 5 using the multiplication table of 5.

What is the least common multiple of 3 9 and 10?

Answer: LCM of 3, 10, 9 is 90.

What is the LCM of 3 and 9 and 12?

36