Students who know their basic multiplication facts may still have trouble with the steps in the pencil and paper multiplication algorithm. Which types of errors are illustrated in the following? a. 5 2 9 5 1 5 4 b. 4 8 9 5 3 2 5 i) It looks like the student multiplied the units digits correctly, and carried to the tens the correct digit, but then an error was made. The student multiplied the carried tens digit and the tens digit of the first factor. ii) It looks like the student multiplied the units digits correctly, and carried to the tens the correct digit, but then an error was made. The student ignored the carried tens digit. iii) The tens digit, which was obtained from multiplying the units digits, was recorded in the units column and the units digit was carried to the tens column. iv) The units digits were multiplied correctly with the correct tens digit carried, but then the student only computed the product of the tens digit plus the carried digit. They did not multiply the units digit of the 2d factor by the tens digit of the 1st factor or the tens factor