Welcome to Sebzo, which starts as a younger kids' game for practicing adding and multiplying and is followed by increasingly difficult problems involving subtraction, multiplication, and division.
(To go right to the sign in and games, click or press here.)
Addition
Harder Addition
Multiplication
The Addition game asks you to add a number up to ten to another number up to 10.
The Harder Addition game asks you to add a number up to 10 to a number up to 100.
The Multiplication game asks you to multiply a number up to 10 by another number up to 10.
Sebzo's harder games, when you think you might be ready for them, are:
Easier Subtraction
Harder Subtraction
Subtraction with negative numbers
Multiplication of negative numbers
Easier Division
Division with remainders
Harder Subtraction asks you to subtracting a number up to 10 from itself or from a greater up-to-100 number.
Subtraction with negative numbers asks you to subtract -10 to +10 numbers from other -10 to +10 numbers.
Multiplication of negative numbers asks you to subtract -10 to +10 numbers from other -10 to +10 numbers.
Easier Division asks you to divide a number by one of its factors.
Division with remainders--Sebzo's hardest game--asks you to divide a larger number by a smaller one that doesn't necessarily divide evenly into the larger number.
After you've played your first 10 problems, if you get at least eight right on the first try, your parents (or other adult) will give you a treat.
You may not get more than one treat a day, though!
You can change games at any time by clicking the green "Change Game" button.
Sebzo includes spoken addition and multiplication tables, any one of which you can listen to
at any time. You get these tables by clicking the green "Listen to Addition or Multiplication
Table" button. (The spoken tables don't work with Safari.)
If your parent or other adult wants to find out about the use and origin of Sebzo, they can press the green button.
This program was written for my grandchildren. It may be used free of charge at any school where arithmetic and multipication are properly taught. By that, I mean that a major part of the instruction is the teacher, while tapping a ruler or stick, and chidren rhythmically recite the tables out loud -- arithmetic tables in Kindergarten or First Grade, multiplication in the First or Second Grade.
Originally I meant Sebzo to have just addition and multiplication, as well as spoken plus and times tables. Then I added the more difficult games. In the future, I might add factors, decimals and percentages and, if my math and programming skills are up to it, addition, subtraction, multiplication, and division of fractions.
If you want to report a bug, make a comment, or ask a question, you may email me at info@sebzo.net.
Thanks to Nenad Svrcikapa, Audrey and Jack Orenstein, and Sara, Lettie, and Imogen Cabot for their help. And to several programmers at Stack Overflow, who more than once came to my rescue.