Equation with Variable
1 x a = 10
a = 10
The art teacher has 20 paintbrushes. She puts paintbrushes on each of the 5 tables in her classroom. How many brushes are on each table?
There are 4 brushes on each table.
Harry bought 8 packs of donuts. Each donut pack has 3 plain donuts, 3 sugar donuts and 2 cinnamon donuts. How many donuts does Harry have in all?
First 3+3+2 = 8 donuts in each pack
8 x 8 = 64
Harry has 64 donuts.
80 x 1 =
8 x 1 = 8 so 80 x 1 = 80
4 x 8 =
4 x 8 is the same as (2 x 8) + (2 x 8) or
4 x 8 is the same as (4 x 4) + (4 x 4)
4 x 8 = 32
a x 5 = 10
a = 2
There are 24 desks in the classroom. If we want to put them into 4 rows, how many desks will be in each row?
There are 6 desks in each row.
There were 3 cups of red jelly beans. There were 6 cups of purple jelly beans. Each cup held 6 beans. How many beans were there in all?
3 + 6 = 9
9 x 6 = 54
There were 54 Jelly Beans in all.
20 x 3 =
2 x 3 = 6 so 20 x 3 = 60
3 x 12
3 x 12 is the same as (3 x 6) + (3 x 6)
3 x 12 is the same as (3 x 10) + (3 x 2)
3 x 12 = 36
3 x a = 9
a = 9
4 people x 9 markers each = 36
They have 36 markers in all.
Dad had 84 dollars in his wallet. He gave 7 dollars to each of his children. He had 7 children in all. How many dollars does he have left?
7 x 7 = 49
84 - 49 = 45
He had 45 dollars left.
5 x 30 =
5 x 3 = 15 so 5 x 30 = 150
5 x 15
5 x 15 is the same as (5 x 10) + (5 x 5)
50 + 25 = 75 so 5 x 15 = 75
35 = a x 5
a = 7
There are 8 cars in the garage. Tom will place new tires on each car. How many tires will tom need?
8 cars x 4 tires on each = 32
Tom will need 32 tires.
Dad made 2 batches of cookies. The first batch had 5 rows with 4 cookies in each row. The second batch had 2 rows with 3 cookies in each row. How many cookies were made in all?
First Batch = 5 x 4 = 20
Second Batch 2 x 3 = 6
Add 20 +6
There were 26 cookies in all
4 x 70 =
4 x 7 = 28 so 4 x 70= 280
4 x 18
4 x 18 is the same as (4 x 10) + (4 x 8)
40 + 32 = 72
4 x 18 = 72
72 = 9 x a
a = 8
Peter goes fishing with Patrick. Peter catches 3 small fish and 3 big fish. Patrick catches four times as many fish as Peter. How many fish did Patrick catch?
3 small fish + 3 big fish = 6 fish
6 fish x 4 times = 24 fish
Patrick caught 24 fish.
The grocery store sold 4 small and 3 large pizzas. The small had 6 slices of pizza and the large had 8 slices of pizza. How many slices of pizza were sold in all?
small pizza slices = 4 x 6 = 24 slices
large pizza slices = 3 x 8 = 24 slices
24 + 24 = 48 slices
They sold 24 slices in all.
7 x 70 =
7 x 7 = 49 so 7 x 70 = 490
6 x 19
6 x 19 is the same as (6 x10) + (6 x 9)
60 +54 = 114
so 6 x 19 = 114