Multiply Mixed Numbers: 1 4/5 × 2 1/2 Step-by-Step Solution

145×212= 1\frac{4}{5}\times2\frac{1}{2}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:05 Let's start by solving this problem.
00:08 First, change each mixed fraction into a simple fraction.
00:24 Now, add up the numerators, which are the top numbers.
00:34 Remember, multiply the top numbers together, and the bottom numbers together.
00:41 Next, find the answer by multiplying those numbers.
00:47 Then, change the answer back to a mixed fraction.
00:52 You can break down forty-five as forty plus five.
00:57 Break the fraction into a whole number and the leftover part.
01:04 Turn the fraction into a whole number, and mix it with any parts left.
01:11 Make sure to simplify as much as you can.
01:18 And there you go! That's your solution.

Step-by-step written solution

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1

Understand the problem

145×212= 1\frac{4}{5}\times2\frac{1}{2}=

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Convert each mixed number to an improper fraction.
  • Step 2: Multiply the improper fractions.
  • Step 3: Simplify the resulting fraction, if needed, and convert it back to a mixed number.

Now, let's work through each step:
Step 1: Convert the mixed numbers to improper fractions.
For 1451\frac{4}{5}:
145=1×5+45=951\frac{4}{5} = \frac{1 \times 5 + 4}{5} = \frac{9}{5}.
For 2122\frac{1}{2}:
212=2×2+12=522\frac{1}{2} = \frac{2 \times 2 + 1}{2} = \frac{5}{2}.

Step 2: Multiply the improper fractions:
95×52=9×55×2=4510\frac{9}{5} \times \frac{5}{2} = \frac{9 \times 5}{5 \times 2} = \frac{45}{10}.

Step 3: Simplify the fraction and convert it back to a mixed number:
4510=92=412\frac{45}{10} = \frac{9}{2} = 4\frac{1}{2}.

Therefore, the product of 145×2121\frac{4}{5} \times 2\frac{1}{2} is 4124\frac{1}{2}, which corresponds to choice 2.

3

Final Answer

412 4\frac{1}{2}

Practice Quiz

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\( 1\frac{4}{5}\times1\frac{1}{3}= \)

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