Worksheet: Choosing Strategies to Add

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 5+8.

Q2:

James and Hannah are trying to find 8+9.

James uses the fact that 8+8=16 and says that 8+9=16+1.

Hannah uses the fact that 9+9=18 and says that 8+9=181.

Who is correct?

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

Q3:

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

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:

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

Q6:

Which addition sentence is equal to 7 + 8?

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

Q7:

Which expression is equal to 6 + 5?

  • A 1 2 + 1
  • B 5 + 4 1
  • C 6 + 5 + 1
  • D 1 2 1
  • E 1 2 + 5

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