13 - 3

 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

 13 - 3 = 4 + 2 = 6 + 9 = 8 + 6 = 10 + 10 = 2 + 6 = 15 - 6 = 13 - 5 = 9 - 7 = 13 - 11 =

# Combined operations

 1 + 6 - 1 = 6 + 1 - 5 = 6 - 1 - 3 = 7 - 6 + 2 = 6 + 1 - 6 = 6 + 11 - 8 = 11 + 9 + 7 = 7 + 11 - 8 = 8 + 6 - 6 = 11 + 9 - 6 =

# Problems

1. In a kiosk I bought a comic at 20 cents and a seed bag at 60 cents.

How much money did I pay?

a) 80 cents.

b) 40 cents.

c) 30 cents

2. Mary had 4 butterflies and one day, she set free 2 of them.

How many butterflies does she have left?

a) 6 butterflies.

b) 2 butterflies.

c) 1 butterfly.

3. John has 9 marbles and Amado has 10 marbles more than him.

How many marbles does Amado have?

a) 19 marbles.

b) 1 marble.

c) 8 marbles.

4. Sebastian had 9 marbles and he won 9 when he was playing with his friends.

How many marbles does he have now?

a) 21 marbles.

b) 18 marbles.

c) 23 marbles.

5. Joaquina has 5 CDs at home, Felisa has 2 and Mercedes has 3.

How many CDs are there altogether?

a) 10 CDs.

b) 8 CDs.

c) 7 CDs.

6. A gardener planted 5 trees in a corner of the garden and then 5 trees in another corner. At the end, 2 trees died.

How many trees are there in the garden?

a) 12 trees.

b) 10 trees.

c) 8 trees.

7. When I went to the recess, I had 9 marbles. I won 4 marbles in a game and then I lost 5.

How many marbles do I have at the end of the recess?

a) 18 marbles.

b) 6 marbles.

c) 8 marbles.

8. Mr. Joaquin had 6 CDs in his store, he brought 6 CDs from the storehouse and then he sold 7.

How many CDs are left in his store?

a) 5 CDs.

b) 17 CDs.

c) 6 CDs.

9. To make an installation, we bought 12 meters of cable. First, we used 2 meters and then 7.

How many meters of cable are left?

a) 21 meters.

b) 4 meters.

c) 3 meters.

10. 10 people travel in a bus. If 6 of them get down and then 5 people get in.

How many people are there on the bus?

a) 8 people.

b) 21 people.

c) 9 people.

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®Arturo Ramo García.-Record of intellectual property of Teruel (Spain) No 141, of 29-IX-1999
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