Worksheet: Addition within 20

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 1 2 + 3
  • B 1 0 + 5
  • C 6 + 9
  • D 1 4 + 2
  • E 1 + 1 4

Q2:

Calculate 5 + 8 .

Q3:

Calculate 1 2 + 6 .

Q4:

What is 7 add 13?

Q5:

Ramy and Rania are trying to find 8 + 9 .

Ramy uses the fact that 8 + 8 = 1 6 and says that 8 + 9 = 1 6 + 1 .

Rania uses the fact that 9 + 9 = 1 8 and says that 8 + 9 = 1 8 1 .

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 8 + 7 = 1 + 1 4
  • B 8 + 7 = 1 6 1
  • C 8 + 7 = 7 + 8
  • D 8 + 7 = 9 + 5
  • E 8 + 7 = 1 0 + 5

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.

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

Q9:

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

His teacher circled the mistake in his answer. Help him by finding .

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 6 + 5 .

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.

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