In this worksheet, we will practice using different strategies to add two numbers with sums up to 20 and choosing which strategies are best.

Q1:

Calculate .

Q2:

James and Hannah are trying to find .

James uses the fact that and says that .

Hannah uses the fact that and says that .

Who is correct?

• AThey are both wrong.
• BThey are both correct.
• COnly Hannah is correct.
• DOnly James is correct.

Q3: One of the equations is WRONG. Which one is it?

• A
• B
• C
• D
• E

Q4:

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? Q5:

Which addition sentence is equal to 7 + 8?

• A13 + 1
• B7 + 8 +1
• C7 + 7 + 1
• D7 + 7 + 7
• E8 + 8 +1

Q6:

Which expression is equal to 6 + 5?

• A
• B
• C
• D
• E

Q7:

What is 17 + 0?

Q8:

What is ?

Q9:

Find .

Q10:

Which expression is equal to ?

• A and 1 less
• B and 1 more
• C and 1 less

Q11:

Make 10 to help find .

Q12:

Which expression is equal to ?

• A and 1 less
• B and 1 more
• C and 1 more