I'm using Sumprduct to get a count of matching numbers in the
following two sets, going from A1:T1, A2:T2

4 12 14 15 16 20 21 22 28 29 31 36 43 47 49 58 59 60 66 69

5 7 9 13 16 21 27 30 31 37 41 43 45 48 51 52 56 59 64 67

the formula I'm using is =SUMPRODUCT(--(COUNTIF(A1:T1,A2:T2)0))

I keep getting an answer of 0, the answer should be 4 (16, 21, 31, 43
match)

Can anyone see what I'm doing wrong?? Thanks