Transcript Number 10 POINTS - Math-HS

Algebra
 Writer:
writes answers on whiteboard
 Calculator: uses calculator
 Thinker: on paper/in head.
 Resources Manager: looks up notes/textbooks
 All members: ensure group is positive &
working at a reasonable noise level.
 All
people must participate. Random checks
may be made to ensure all group members
know how to get their correct answer.
(Bonus points available for this)
 Group
x chooses the question
 Time limit given
 When time is up, group x has 1st option to
answer.
 If correct winner takes all points.
 If incorrect, all other correct groups get half
points.
 Next group in turn (clockwise).
EXPRESSIONS
10
20
30
40
100
SIMPLIFYING
10
20
30
40
100
SUBSTITUTION
10
20
30
40
100
SOLVING
10
20
30
40
100
 Write
in mathematical symbols:
The sum of 3x and 5
 Rewrite
5x5x5x5 in index form
 Write
using mathematical symbols:
five less than half a number
Write an expression for the perimeter
of the box and simplify.
I
am building a model pyramid using a wire
frame. The base is a square with sides
length x+5m and the diagonals are x+1m long
each.
Write an expression
for how long the wire
should be,
simplify and tell me
what length to buy.
 Write
down the like terms
x
x
xy
2
2x
5 x  3x  x  5
5 x  3xy
3x 2 x

5
3
2
3
(2a ) ab

4
10a b b
Evaluate the expression below
when x=4 and y=2
3x  5 y
If a=3, b=-5 and c=7, what does
the following expression equal?
3a  b
c 1
 John
sells mp3 players for a job. Each mp3
player costs him $150 and he sells them for
$200 each. His business balance can be
expressed as:
B=200y-150x
 where x is the number her has buys and y is
the number he sells.
 Substitute into the equation to find the
balance if John buys 100mp3 players, and
sells 82 of them.
 The
sum of interior angles of a polygon is
given by the formula
 A.
S=180n-360.
Substitute to find the sum of interior
angles of a 10 sided shape.
 B. If the shape is regular, what is the size of
each angle?
The weight in kg of a typical baby is given
by the formula
2t  7
w
3
Where t is the age in months.
A: Find the weight of a typical baby at age
1 year.
B: If a baby 8kg, how old would
you expect it to be?
 Solve,
showing working
5 x  3  10
 Solve,
showing correct working
x
1  6
3
x/3=5
x=15
 Solve,
showing working:
3x  1
6
2
 Solve,
showing correct working:
3( x  2)  25
 Two
numbers (x & y) add to 87 and have a
difference of 29.
 A: Use this information to write two
equations.
 B: Solve the equations to find x and y.