Try: 3.6 X 2.9 using the CI scale

Try: 3.6 X 2.9 using the C and CF and DF scales

Try: 3.6 X 2.9 using only CF and DF

Try: 3.6 X 2.9 using only the A and B scales

Try: 402 X 0.071

Taking the digits first, then the powers of ten second, we see: 4 X 7 = 28. 102 X 10-2 = 100 =1. 28 X 1 = 28. Answer is about 28.