In this worksheet, we will practice using any strategy to add within 20 and comparing different strategies.

**Q1: **

Which of these is NOT equal to 15?

- A
- B
- C
- D
- E

**Q2: **

Calculate .

**Q3: **

Calculate .

**Q5: **

Ramy and Rania are trying to find .

Ramy uses the fact that and says that .

Rania uses the fact that and says that .

Who is correct?

- AOnly Rania is correct.
- BThey are both wrong.
- COnly Ramy is correct.
- DThey are both correct.

**Q6: **

Think about adding 8 and 7.

One of the equations is WRONG. Which one is it?

- A
- B
- C
- D
- E

**Q7: **

Rania was asked to solve .

She wrote

Is her solution correct?

- Ayes
- Bno

**Q8: **

Sally tried to solve by using the doubling numbers facts, but she got the answer wrong.

**Q9: **

George tried to solve by using the making ten strategy, but he got the answer wrong.

**Q10: **

Shady was asked to solve .

He wrote

Is his solution correct?

- Ayes
- Bno

**Q11: **

Aisha tried to solve by using the doubling numbers facts, but she got the answer wrong.

Her teacher circled the mistake in her answer. Help her by finding .

**Q12: **

Fady was asked to solve .

He wrote

Is his solution correct?

- Ayes
- Bno

**Q13: **

This is an addition machine. It adds six to any number you put in.

What number will you get if you put 3 in?

What number will you get if you put 12 in?

**Q14: **

Find the smallest two digit number whose digits add up to 8.