• Simple multiplication uses C and D scale
• “wrap around” multiplication uses C and D scales
• Folded-scale multiplication uses C, D, CF and DF scales
• Multiplication by π uses D and DF scales
• Example: calculating 2.3 x 3.4
- Slide the leftmost index 1 on C over 2.3 on the D scale
- Move the cursor to 3.4 on the C scale
- The cursor is on the D scale just a bit over 7.8 or 7.82. This is the answer.
• Simple division uses C and D scales
• Reciprocal uses C and CI scales
• Example: Calculate 4.5 / 7.8
- Move the cursor to 4.5 on the D scale
- Slide 7.8 on the C scale to the cursor
- Move the cursor to either the leftmost or rightmost 1 on the C scale, whichever is in range. In this case, you would move it to the rightmost 1
- The cursor is now at 5.76 on the D scale
- We know that the correct answer is near 4/8 = 0.5, so we adjust the decimal place to get 0.567.