📚 Topic Summary
Estimating decimal quotients using compatible numbers involves rounding the divisor and dividend to numbers that are easy to divide mentally. Compatible numbers are close to the original numbers but make the division simpler. This technique helps you find an approximate answer quickly without needing a calculator. This is super handy for checking if your calculator answer makes sense or for quick mental math!
For example, to estimate $15.8 \div 3.9$, we can round $15.8$ to $16$ and $3.9$ to $4$. Then, $16 \div 4 = 4$, so our estimate is 4.
🔤 Part A: Vocabulary
Match the term with its definition:
| Term |
Definition |
| 1. Quotient |
A. Numbers that are easy to divide mentally |
| 2. Dividend |
B. The number being divided |
| 3. Divisor |
C. The answer to a division problem |
| 4. Estimate |
D. The number dividing the dividend |
| 5. Compatible Numbers |
E. An approximate value or calculation |
Match the letters A-E to the numbers 1-5 based on the correct definitions.
✍️ Part B: Fill in the Blanks
Complete the following paragraph using the words: compatible, dividend, divisor, quotient, estimate.
To ______ decimal quotients, we use ______ numbers. We round the ______ and ______ to make the division easier. The result is an approximate ______, which gives us a quick idea of the answer.
🤔 Part C: Critical Thinking
Explain how using compatible numbers can be helpful in real-life situations. Give an example.
