Question | Answer |
1-1 correspondence | a pairing of the elements of A with the elements of B so that each element of A corresponds to exactly one element of B, and vice versa. |
set | A collection of objects |
elements or members | the objects of the set |
Mayan | 360s
20s
1-19 |
babylonian | 3600 60 under 60 |
I | 1 |
V | 5 |
X | 10 |
L | 50 |
C | 100 |
D | 500 |
M | 1,000 |
If a number is deficient, it is prime. | FALSE 4 IS DEFICIENT AND NOT PRIME. |
If a number is prime, it is deficient. | True |
If 4|n and 6|n, then 24|n. | FALSE 4|12 AND 6|12 BUT 24 DOESN’T DIVIDE 12. |
If 5|n and 3|n, then 15|n | TRUE |
If a|n, then there is a number b such that a times b = n | TRUE |
1,260 has exactly 6 factors. | FALSE 48 FACTORS |
If n is divisible by 24 it is also divisible by 4 and 6. | TRUE |
561 is a prime number. | FALSE 3|561 |
One is a prime number | FALSE ONE HAS NOT PROPER FACTORS. |
All prime numbers are odd | FALSE TWO IS PRIME AN EVEN. |
If 12|n, then 3|n | TRUE |
To decide if 36 divides a number, you can try 4 and 9. If 4 and 9 divide the number, then 36 divides the number | True |
If n is divisible by 4 and 6 it is also divisible by 24 | FALSE: 4|12 AND 6|12 BUT 24 DOESN’T DIVIDE 12. |
32|4 | FALSE THERE DOES NOT EXIST A WHOLE NUMBER B SUCH THAT 34 • B = 4. |
Every prime number greater than 2 is one more than an odd number | FALSE EVEN |
To determine if a number is divisible by 11, add its digits. If 11|sum, 11|number. | FALSE, CIRCLE EVERY OTHER DIGIT. ADD THE CIRCLED DIGITS. ADD THE OTHER DIGITS. FIND THE DIFFERENCE OF THESE TWO SUMS. IF 11|THIS DIFFERENCE, 11|THE NUMBER. |
GCF (a,b) + LCM (a,b) = a• b. | FALSE, GCF (a,b) • LCM (a,b) = a• b |
Consider 12, 447, 2d2. What digit should "d" be for this number to be divisible by 18.
List all possible answers. | 5 |
2. Consider 14, d27, 120. What digit should "d" be for this number to be divisible by 20.
List all possible answers | Any digit or 0,1,2,3,4,5,6,7,8,9 |
3. Consider 31, 106, 23d. What digit should "d" be for this number to be divisible by 12.
List all possible answers. | 2 |
4. Consider 12, 447, 2d2. What digit should "d" be for this number to be divisible by 24.
List all possible answers. | Since d must be 3 or 7 to pass the 8 rule, and neither of these will result in a sum of digits that is divisible by 3, the answer is: NO POSSIBLE DIGIT. |
Show that you know the process for determining if 214,516,318,199 is divisible by 11. | Sum of circled digits = 2 + 4 + 1 + 3 + 8 + 9 = 27
Sum of other digits = 1 + 5 + 6 + 1 + 1 + 9 = 23
27 – 23 = 4
Since 11 does not divide 4 it does not
divide the given number. |