November contest
Mystery equations for November Math Mania
The
Math Mania questions for November feature a
lot of mystery equations where you get the correct answers
by substitutions.
After the easy time you had with the October puzzles, Ms.
Math Mania is toughening up the questions.
Let's see if you're up to the task.
So far, we've had a goodly number of entrants and a number
of winners. After having eight kids get all of the September
questions correct, we had a whopping 34 entrees with all of
the October questions answered correctly.
(To meet the October winners and get the answers to last
month's puzzles, just click
here.)
Ms. Amy Ruzicka is Ms. Math Mania.
She's a math teacher at Bayless Junior High.
She's named the three questions for November, "Canine Computation,"
"Mystery Multiplication" and "Equation Frustration."
The rules for Math Mania remain the same. Competition is
open to St. Louis area kids 8 through 13. An entry blank and
the November puzzle are attached below.
Be sure to follow the rules, especially the one regarding
the postmark for each entry. The entries must be postmarked
by the 15th of the month in order to be considered in the
contest.
November Math Mania Challenge:
DIGIT DILEMMAS
1. CANINE COMPUTATION
Rhombus, the smartest dog in the world, was
doodling in his math diary when he came up with three equations:
A-B=C
D/E=F
G+H=I
He was about to write a fourth equation using
multiplication when an interesting thought occurred to him.
Instead of using a new set of numbers (J, K, L) for his fourth
equation, he would use the answers of the three existing equations:
C*F=I
Now the only question in his mind was, "Can
I replace the letters A through I with the digits 1 through
9 in such a way that all four of my equations are correct?"
Answer:
|
A=
|
B=
|
C=
|
| D= |
E= |
F= |
|
G=
|
H=
|
I=
|
MYSTERY MULTIPLICATION
Use each of the digits 1, 2, 3, 4, 5 and 6
once only, in this multiplication problem to make it correct.
? ?
x ?
----
? ? ?
Answer: _____________________
3. EQUATION FRUSTRATION
Arrange the ten digits 0 to 9 in three different
equations, using three of the four operations of addition, subtraction,
multiplication, and division, and using no signs except the
ordinary +, -, ´, & ¸ . Here is an example to make it clear
(note that the example is not correct because 3 was used twice
and 2 was not used at all):
3 + 4 = 7 9
- 8 = 1
5 X 6 = 30
Answer: __________________________________________
