0.6 or 3/5 metric teaspoons
21 milliliters is 4.26 teaspoons.
That is 2.2 teaspoons
6 metric teaspoons
92 metric teaspoons
20 metric teaspoons
1.28 metric teaspoons
2 metric teaspoons
45 milliliters is 9.13 teaspoons.
Apparently there is a difference between US teaspoons, UK teaspoons, and metric teaspoons. Since I wasn't sure where you were, I gave you all three. In any case, 0.5 milliliters is just a smidgeon. US teaspoons: 0.5 ml = 0.10 tsp UK teaspoons: 0.5 ml = 0.14 tsp Metric teaspoons: 0.5 ml = 0.1 tsp
Six teaspoons is about 29.6 mL
20ml in 4 metric teaspoons