Substitution
Like terms
Multiplying with Algebra
Expanding
Number 13
100
If, x=5
x+1=?
6
100
a+a
2a
100
2\timesa
2a
100
2(x+1)
2x+2
100
What is 6 + 7?
13
200
If y=10
y-4= ?
6
200
2a+a
3a
200
3\times2a
6a
200
3(x+1)
3x+3
200
In rugby league, what position wears number 13?
Lock (or loose forward)
300
If x=5 and y=10
x+y= ?
15
300
2a-a
a
300
a\timesa
a^2
300
2(x-1)
2x-2
300
What is
52\div 4 ?
13
400
If x=5
2x+1=?
11
400
2a+2b+3a+4b
5a+6b
400
2a\times3b
6ab
400
2(2x+1)
4x+2
400
What is friggatriskaidekaphobia?
Fear of Friday the 13th
500
If x=5 and y = 10
2(y-x)=?
10
500
3a+4b+2a-2b
5a+2b
500
2a\times3ab
6a^2b
500
-2(2x+1)
-4x-2
500
What element has the atomic number of 13?
Aluminium