Stacy multiplied 5x9 and said the answer was 44.what two patterns could you use to show that her answer is not correct?

2 answers

Multiples of 5 end in 5 or 0.

The digits of multiples of 9 add up to 9.
he can use the finger trick ad count by 5's or he can think as it 9x6 but swicth the numbers around.