The mistake that Oscar makes is in step 2, he puts the decimal point in the wrong place when he divides 0.81 by 9.
What is the mistake that Oscar makes?
Division is the process of grouping a number into equal parts using another number. The sign used to denote division is ÷.
63.81 ÷ 9
63 ÷ 9 = 7
0.81 ÷ 9 = 0.09
7 + 0.09 = 7.09
To learn more about division, please check: https://brainly.com/question/13281206
#SPJ2
