The limit for stacking counters on one square should be five.So five tokens on the square 20 represents the number 100. The teacher should decide the range of numbers that are being studied, but it should be at least one through 50. 1. Names of Numbers Students need to learn to use correct names for the numbers they represent on the board. Seven Forty-One 2. First Arithmetic Activity Students are asked to add several small numbers, each number represented by just one counter, in the order in which they are given. All students using white counters are adding 2 + 5 + 1 + 1 + 5. And students using red counters add 1 + 2 + 5 + 5 + 2. After they finish, they compare the red and white numbers to answer two questions: Are the numbers equal? And if not, which number is bigger? and: What is their difference?
Regrouping
So, 2 + 5 + 1 + 1 + 5 = 14.
Regrouping
So, 1 + 2 + 5 + 5 + 2 = 15. The numbers are not equal because 14 ≠ 15. 15 > 14. The difference is 15 - 14 = 1. 3. Second Arithmetic Activity Students are adding lists of one-digit numbers as in activity one. This activity needs to be repeated (with different lists) until all students achieve a desired degree of proficiency. Add 4 + 5
So, 4 + 5 = 9. Add 3 + 2 + 4
Regrouping
So, 3 + 2 + 4 = 9. Therefore, 4 + 5 = 3 + 2 + 4 = 9 which shows that changing the order of numbers does not alter their sum. Number Board index |