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In this lesson, we will learn how to add two tens numbers with or without using base ten blocks.

Q1:

Find the two numbers from 10, 20, 60, and 0 which add up to 30.

Q2:

Which of the following numbers add up to 60?

Q3:

Complete the following: 4 + 3 = , 4 + 3 = t e n s t e n s , 4 0 + 3 0 = .

Q4:

What is the missing number?

+ 8 0 = 1 0 0

Q5:

Find the sum.

Hint: Add the ones and then add the tens.

Q6:

Find the number that when added to 20 gives 90.

Q7:

Nehal has 20 beads. She wants to add on 10 more. How many will she have altogether?

Q8:

Write the missing number: 1 0 + = 5 0 .

Q9:

Charlotte is adding 15, 8, and 28.

She added the ones first.

Add the tens to finish her work and find the total.

Q10:

Hint: Add the ones then the tens.

Q11:

Dalia spilled ink on her homework.

Find the covered numbers.

Q12:

How many tens are there altogether?

Q13:

Q14:

Add to find the total.

Hint: Think about tens and ones. Use base ten blocks to help you.

3 + 6 = .

3 0 + 6 0 = .

Q15:

Q16:

Hint: Think about what happens when there are more than 10 ones.

Q17:

Hint: Add the ones then the tens. What do you do if you have more than 10 ones?

Q18:

7 + 2 = .

7 0 + 2 0 = .

Q19:

Mona is adding tens.

Find the missing numbers.

3 tens plus 4 tens is tens.

3 0 + 4 0 = .

Q20:

Hint: Add the ones then the tens. What happens when there are more than 10 ones?

Q21:

Ramy is using base ten blocks to help him add 9 to 34.

He adds the ones first. There are 13 ones.

Pick the model that shows what he should do.

Q22:

Fares spilt ink on his homework.

Help him find the covered numbers.

Q23:

Pick a model that shows the sum.

Q24:

Q25:

Look at how Dalia adds numbers.