8 - 2

 Tables of addition - - - - - - - - - - Tables of subtraction - - - - - - - - - -

 Simple operations Combined operations Problems Aritmetic tables

Instructions: Press one of the buttons on the right column The correct number is put in red .

In the combined operations, you must do the first operation with the first two numbers. Then, you must do the second operation with the result and the third number.

# Simple operations

 8 - 2 = 3 + 9 = 5 + 8 = 7 + 2 = 9 + 3 = 11 + 2 = 14 - 4 = 14 - 6 = 14 - 8 = 14 - 10 =

# Combined operations

 1 + 2 - 2 = 6 - 5 + 1 = 5 + 5 -1 = 2 + 4 + 6 = 5 - 3 + 4 = 6 + 9 - 7 = 10 + 6 + 9 = 6 + 10 - 9 = 10 - 9 + 10 = 8 + 7 - 8 =

# Problems

1. Mary has a collection of 4 dolls. She gave 3.

How many dolls does Mary have left?

a) 7 muñecas.

b) 1 muñeca.

c) 12 muñecas.

2. There were 6 books in the library of my house. For my birthday, I received 6 books.

How many books do I have now?

a) 10 books.

b) 14 books.

c) 12 books.

3. There were 11 liters of water in a jar and I take out 7 liters.

How many liters of water do I have now?

a) 18 liters.

b) 4 liters.

c) 5 liters.

4. I have 10 candies in my closet. I give 4 to my friends.

How many candies do I have left?

a) 14 candies.

b) 8 candies.

c) 6 candies.

5. Augustine has 4 marbles, José Ramón has 2 and Andrés has 3.

How many marbles are there altogether?

a) 3 marbles.

b) 9 marbles.

c) 7 marbles.

6. There were 9 cookies in a box. First I ate 2 cookies and then 3.

How many cookies do I have left?

7. Marta had 6 books on her bookcase. She received 4 in her birthday and she lent 3 to her friends.

How many books does she have now?

a) 13 books.

b) 10 books.

c) 7 books.

8. 7 passengers travel in a plane. At the airport, 6 people go aboard and then 9 go down.

How many people are there in the plane?

a) 22 passengers.

b) 4 passengers.

c) 5 passengers.

9. Marta has 11 euros. Her mother gives her 11 and she spent 9 euros on school supplies.

How much money does she have now?

a) 13 Euros.

b) 31 Euros.

c) 12 Euros.

10. A school bus transports 9 children. At the first stop, 6 children get down and then 10 new children get in.

How many children are there in the bus?

a) 12 children.

b) 35 children.

c) 13 children.