GRADED LESSONS IN ARITHMETIC.

GRADE III.

LESSON 1.

Give the pupils a handful of sticks.

1. Tie 10 sticks into a bundle. Call this bundle a TEN. 2. Make another ten. Make a third ten.

3. How many tens and how many units must you take to have 11? 21? 12? 22? 13? 23? 14? 24? 15? 25? 16? 26? 17? 27? 18? 28? 19? 29? 30? 4. Write 1 ten and 9 units. 5. Write 2 tens and 1 unit. 6. Write 2 tens and 4 units. 7. Write 1 ten and 7 units. 8. Write 1 ten and 3 units. 9. Write 2 tens and 5 units. 10. Write 1 ten and 8 units.

11. Under 2 tens and 5 units, write 1 ten and 2 units. 12. Under 2 tens and 8 units, write 2 tens and 1 unit. 13. Under 2 tens and 1 unit, write 1 ten and no units. 14. Under 1 ten and no units, write 2 tens and 4 units. 15. Under 1 ten and 9 units, write 1 ten and 4 units. 16. Write the following in columns, units under units and tens under tens: 4 tens, 6 units; 2 tens, 7 units; 6 tens, 7 units; 5 tens, 6 units; 7 tens, 3 units; 6 tens, 4 units.

17. Write in columns: 5 tens, 2 units; 2 tens, 1 unit; 2 tens, 6 units; 1 ten, 3 units; 9 tens, 2 units; 7 tens, 5 units.

1

NOTE. In the second grade the pupils learned that 5 and 7 are 12; they can now readily see that 50 and 70 are 5 tens and 7 tens, or 12 tens, or 120.

- In the place of 10 in Example 1, put 20, 30, 40, 50, 60, 70, 80, 90,

NOTE.

- In Example 3, and all the other Examples in this lesson, in place of 1 put 2, 3, 4, 5, 6, 7, 8, 9, and add; also in the tens place put 1, 2, 3, 4, 5, 6, 7, 8, 9, and add.