# Faster way to sum multiplications

#### Simon4s

##### Board Regular
Column A has a list of percentages. column B has a list of values.

How can i do this really fast:

A1*B1+A2*b2+A3*B3+A4*B4

### Excel Facts

VLOOKUP to Left?
Use =VLOOKUP(A2,CHOOSE({1,2},\$Z\$1:\$Z\$99,\$Y\$1:\$Y\$99),2,False) to lookup Y values to left of Z values.

#### SpillerBD

##### Well-known Member
=sumproduct(a1:a6,b1:b6)

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