1. English System (Ruler)

2. Conversions… (English  Metric)
Fraction = ¼ inches
** divide top number into bottom to get decimal
1 / 4 = .25 in
Decimal = .25 in
** to get metric, multiply decimal by 25.4mm
.25 in * 25.4mm = 6.35 mm in
Metric = 6 mm

3. Let’s practice (English System)

4. Let’s practice (English System)

5. Let’s practice (English System)

6. Conversions… (Metric  English)
Metric = 4 mm
** divide metric # by 25.4 mm to get decimal
4 mm * in = in mm
Decimal = in
** to get fraction, put decimal in fraction form over 1.
Then, multiply both top & bottom by 16. Round numerator.
.1575 in * 16 = 2.52 in = in
Fraction = 3 in 16

7. Let’s practice….

8. Let’s practice….

9. Let’s practice….