Maths mate term 4 sheet 7 Q- 23

Predict- I predict that this question will be about problem solving.

Read- This questions says: The digit sum for 95 is 9+5, or 14. How many two digit numbers have a digit sum of 9?

Clarify-  Nothing to clarify.

BIG QUESTION- The BIG QUESTION is how many two digit numbers have a sum of nine?

Maths tool box- I will use the strategy prior knowledge.

Solve- First I will write down all the pairs to nine which are- 8+1, 7+2,6+3 and 5+4 or  81, 72 , 63 and 54.  So count them all up and they equal to 4.

Summary- In summary there are four two digit numbers that have a sum of nine!

 

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