The subtraction formula within 2.5 is 5-5=0? 4-4=0? 3-3=0? 2-2=0? 1- 1=0? 5-4= 1? 4-3= 1? 3-2= 1? 2- 1= 1? 5-3=2? 4-2=2? 3- 1=2? 5-2=3? 4- 1=3? 5- 1=4
Third, the formula of 0 0+0=0? 1+0= 1? 5-0=5? 5-5=0?
Mathematical addition table
An addition table is a table for finding the addition of a number. List the results of adding any two digits into a table, which is called an addition table for beginners to use? . Commonly used addition tables are 10 and 20.
Addition table within 10
The addition table within 10 is a common formula for junior students, and it is also the basis for advanced students to learn more complex calculations. The addition table within 10 * * 45 questions are arranged into an addition table in a certain order, which is called the addition table within 10. Vertically, the number in the first column is 2 and the number in the second column is 3. Horizontally, the first line is a few plus 1, the second line is a few plus 2, and the numbers in each line are 1 from left to right.
Addition table within 20
There are 36 questions in carry addition within 20 * *, which are arranged into a table according to certain rules, which is called carry addition table within 20. Horizontally, the scores of each question in each row are 1 1, 12, 13, 14, 15, 16, 17. Look at it vertically, and arrange it according to 9 plus a few and 8 plus a few. The first addend of each vertical line is the same. After the second addition, one question is more than the previous one 1, and the sum is also more than the previous one 1.
From the upper right corner to the lower left corner, it is arranged by several plus nine and several plus eight, and the second addend on each diagonal is the same. After the first addition, one question is more than the previous one 1, and the sum is also more than the previous one 1.