Course · Math · Primary
Column arithmetic
Three lessons, three teachers, and one way for every exercise: line it up in columns, step by step. Addition and subtraction with Eti, multiplication with Berthold and long division with Bella - with questions for you in every lesson, and exercises you solve on your own.
By Avatutor3 lessons · about 18 min · taught in Hebrew
What you’ll learn
- Add in columns - and carry one when you pass ten
- Subtract in columns - and borrow from the neighbor, even when the neighbor is zero
- Multiply in columns - a row for each digit, and a zero that shifts left
- Divide with long division - divide, multiply, subtract, bring down
- Check the answer - subtraction with addition, division with multiplication
Course intro Start the course 
Eti
Classic classroom
EtiClassic classroomThe lessons open in the app, for a registered account. A 3D teacher explains, asks and answers every question.
The lessons
- 1Column addition and subtractionEti teaches: start from the right, carry over, borrow from the neighbor - and what to do when the neighbor is zero. At the end, two exercises you solve on your own.~6 min
- 2
Long multiplicationBerthold teaches: times a single digit, then 358 times 38 - a row for each digit, a zero that shifts, and the sum at the end. Then an exercise you solve on your own.~7 min - 3
Long divisionBella teaches: divide, multiply, subtract, bring down - and again. What to do when the first digit is too small, and how to check with multiplication. At the end, two exercises you solve on your own.~5 min