27 + 39 (I can add 27 + 40 = 67 and then subtract 1 to make 66. OR, I can adjust the question to be 26 + 40 to get a sum of 66.
344 + 399
1400 + 2900
0,64 + 0,29
We ended our class with a game of Data Duel where students got to practice calculating mean, median, mode and range (étendue).