If
a
b
=

c
d
then, a × d = b × c

If
a
b
=

c
d
then, a × d = b × c

Solve for x if
5
x

=
10
16

The proportion becomes
5
8

=
10
16

5
x

=
10
16

Solve for n if
8
10

=
n
25

200
10

=
10n
10

If
a
b

=
c
d
then,

a + b
b

=
c + d
d

x  8
8

=
6
4

x  8 + 8
8

=
6 + 4
4

x
8

=
10
4

If
x
y

=
x
4
then, y = 4

For instance If
50
y

=
50
100
then, y = 100

If
18
y

=
x
y
then, x = 18

If
a
b

=
c
d
then,

a + c
b + d

=
a
b

a + c
b + d

=
a
b

Say you have
x + 2
8 + 4

=
x
8

It is equivalent to
x
8

=
2
4

Solve for x if
5
x

=
10
16

The proportion becomes
5
8

=
10
16

5
x

=
10
16

Solve for n if
8
10

=
n
25

200
10

=
10n
10

If
a
b

=
c
d
then,

a + b
b

=
c + d
d

x  8
8

=
6
4

x  8 + 8
8

=
6 + 4
4

x
8

=
10
4

If
x
y

=
x
4
then, y = 4

For instance If
50
y

=
50
100
then, y = 100

If
18
y

=
x
y
then, x = 18

If
a
b

=
c
d
then,

a + c
b + d

=
a
b

a + c
b + d

=
a
b

Say you have
x + 2
8 + 4

=
x
8

It is equivalent to
x
8

=
2
4

Mar 24, 17 09:43 AM
A printable first grade math test that can readily be printed and taken to find out how well you or your kids know very basic concepts of math.
New math lessons
Your email is safe with us. We will only use it to inform you about new math lessons.
Mar 24, 17 09:43 AM
A printable first grade math test that can readily be printed and taken to find out how well you or your kids know very basic concepts of math.