What are 9 factors?
Table of Factors and Multiples
| Factors | Multiples | |
|---|---|---|
| 1, 7 | 7 | 14 |
| 1, 2, 4, 8 | 8 | 16 |
| 1, 3, 9 | 9 | 18 |
| 1, 2, 5, 10 | 10 | 20 |
What is a number divisible by 3?
Rule: A number is divisible by 3 if the sum of its digits is divisible by 3. 375, for instance, is divisible by 3 since sum of its digits (3+7+5) is 15. And 15 is divisible by 3. Check if the following number: is evenly divisible by three.
What is a number divisible by 3 and 5?
A number is divisible by 15 if it is divisible by 3 and 5. A number is divisible by 18 if it is divisible by 2 and 9. A number is divisible by 20 if ist last digit is a 0 and the second last digit is even.
How do divisibility rules work?
Divisibility Rules for some Selected Integers Divisibility by 1: Every number is divisible by 1 1 1. Divisibility by 2: The number should have 0 , 2 , 4 , 6 , 0, \ 2, \ 4, \ 6, 0, 2, 4, 6, or 8 8 8 as the units digit. Divisibility by 3: The sum of digits of the number must be divisible by 3 3 3.
What is the divisibility rule of 7 and 11?
Rule: Take the last digit and cross it out from the original number. Then double it. Subtract it from the “new” number which is the original number excluding the last digit. If the difference is divisible by 7, then the original number must also be divisible by 7.
How do you teach divisibility rules?
Activity:
- Roll 3 dice.
- Put the dice together in a line. Use the numbers on the dice to form a three digit number.
- Referencing the divisibility rules chart, determine if the number is divisible by 2, 3, 4, 5, 6, 9, and 10.
- Put an X in the box of any divisible factors.
- Repeat the process with more three digit numbers.
Which is exactly divisible by 11?
Take the alternating sum of the digits in the number, read from left to right. If that is divisible by 11, so is the original number. So, for instance, 2728 has alternating sum of digits 2 – 7 + 2 – 8 = -11. Since -11 is divisible by 11, so is 2728.
What is the remainder when 235 is divided by 3?
The result of division of 2353 is 78 with a remainder of 1 .
What number is not divisible by 10?
A number is divisible by 10 if the last digit of the number is 0. The numbers 20, 40, 50, 170, and 990 are all divisible by 10 because their last digit is zero, 0. On the other hand, 21, 34, 127, and 468 are not divisible by 10 since they don’t end with zero.
What is the sum of the numbers from 1 to 100 which are divisible by 6?
16 Numbers are divisible by 6 which lies 1 to 100. Hence, The Sum Of 16 Term which lies 1 to 100 and also divisible by 6 is 816.
What is the sum of the first 20 terms in an arithmetic sequence?
The sum of first 20 terms of an A.P. is 1060. The 5ᵗʰ term of AP is 20. ∴ The 15ᵗʰ term of AP is 80.
What are the numbers divisible by 2?
Divisibility by 2, 4, and 8 All even numbers are divisible by 2. Therefore, a number is divisible by 2 if it has a 0, 2, 4, 6, or 8 in the ones place. For example, 54 and 2,870 are divisible by 2, but 2,221 is not divisible by 2. A number is divisible by 4 if its last two digits are divisible by 4.
What are factors of 20?
The factors of 20 are the numbers, which produce the result as 20 when a pair of factors are multiplied together. These factors are 1,2,4,5,10 and 20. Factor pairs of the number, that results in the original number when multiplied together. To find the factors of a number, 20, we will use the factorization method.
What are factors of 80?
The factors of 80 are 1, 2, 4, 5, 8, 10, 16, 20, 40, and 80.
What are factors of 120?
The factors of 120 are 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60 and 120.
What are the prime factors of 55?
The prime factorization of 55 is expressing 55 as the product of prime numbers which gives the result as 55. Thus, the prime factorization of 55 is 55 = 5 × 11.
What are the factors of 160 in pairs?
Factor pairs are the pairs of two numbers which, when multiplied, give the number. Factor pairs of 160 are (1, 160), (2, 80), (4, 40), (5, 32), (8, 20), and (10, 16).