# How do you estimate using compatible numbers?

Asked By: Maryvonne Tepelboim | Last Updated: 14th February, 2020
Category: education primary education
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1. Compatible numbers are pairs of numbers that are easy to add, subtract, multiply, or divide mentally. When using estimation to approximate a calculation, replace actual numbers with compatible numbers.
2. Example 1 (Addition) 500 + 300 = 800.
3. Example 2 (Subtraction) 19.4 − 3.8 = 15.6.
4. Example 3 (Multiplication)

Similarly one may ask, what is the difference between rounding and compatible numbers?

We use compatible numbers to make the problem easier to solve in our head by rounding each number to the nearest ten, twenty, fifty or hundred. But if we make the numbers compatible and round up to the nearest hundred or ten spot, 300 and 350 are much easier to compute in our heads.

Secondly, what are some examples of compatible numbers? Some examples of compatible numbers when doing addition are 225 and 75, 298 and 2, and 540 and 60. Some examples of compatible numbers when doing subtraction are 435 and 25, 800 and 600, and 5986 and 2986.

Similarly, you may ask, what does it mean to estimate the quotient?

Estimating quotients isn't that hard so long as you use compatible numbers! A quotient is the answer you get after dividing one number by another, and compatible numbers are numbers that are close to the numbers in question yet can divide one another easily.

Which number is compatible with 240?

a highly composite number since it has 20 divisors total (1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 40, 48, 60, 80, 120, and 240), more than any previous number. a refactorable number or tau number, since it has 20 divisors and 20 divides 240.

### How do you estimate decimals when dividing?

Dividing Decimals
1. Step 1: Estimate the answer by rounding .
2. Step 2: If the divisor is not a whole number, then move the decimal place n places to the right to make it a whole number.
3. Step 3: Divide as usual.
4. Step 4: Put the decimal point in the quotient directly above where the decimal point now is in the dividend.

### What are compatible fractions?

Round the whole number to the closest compatible number to the denominator. Compatible numbers are numbers that are close in value to the real number that would make it easier to find an estimate calculation. You can round the whole number to a number that is compatible to the denominator of the fraction, 3.

### What would make numbers compatible?

In mathematics, compatible numbers are the numbers that are easy to add, subtract, multiply, or divide mentally. Compatible numbers are close in value to the actual numbers that make estimating the answer and computing problems easier.

### How do you round a number?

Here's the general rule for rounding:
1. If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up. Example: 38 rounded to the nearest ten is 40.
2. If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down. Example: 33 rounded to the nearest ten is 30.

### What is compatible numbers 3rd grade?

Compatible numbers are numbers that are easy to work with mentally, such as parts of 10. Students who memorize 8 + 2 = 10 can more easily reason that 10 - 2 = 8. By third grade, students can also quickly answer 80 + 20 or 100 - 20 by recognizing compatible numbers.

### What are compatible numbers with decimals?

Answer: The estimated quotient of 4,189 and 6.3 is 700. In Example 2, each factor was changed to a compatible number. The numbers 4,200 and 6 are compatible since they make it easy to do mental arithmetic. When estimating decimal quotients, it is easiest to use compatible numbers.

### What is front end estimation?

Front End Estimation. Front-end estimation is a particular way of rounding numbers to estimate sums and differences. To use front- end estimation, add or subtract only the numbers in the greatest place value. Then add the decimals rounded to the nearest tenth.

### What is a number sentence example?

A number sentence can use any of the mathematical operations from addition, subtraction, multiplication to division. Number sentences can be true or they may not be true. For example: 10 + 5 = 15.

### What are place values?

The place value is the value of the location of a digit in a number. The place values are determined by how many places the digit lies to the right or the left of the decimal point. The second place to the left of the decimal is the tens place, or 10^1.

### What are friendly numbers elementary math?

In number theory, friendly numbers are two or more natural numbers with a common abundancy index, the ratio between the sum of divisors of a number and the number itself. Two numbers with the same "abundancy" form a friendly pair; n numbers with the same "abundancy" form a friendly n-tuple.