70
Adding three or more numbers
Textbook Part 2, pp. 60–61
GoalFind the sum of three or more addends.
New words
with several parts · ko‘p komponentlilake · ko‘lsea · dengizriver · daryo
Explanation
To add three or more numbers, add them one after another: first the first two, then add the third to the result. 22 + 5 + 12 = 27 + 12 = 39.
Worked examples
In geography they learned about 24 lakes, 13 seas and 22 rivers: 24 + 13 + 22 = 37 + 22 = 59 bodies of water.
11 + 13 + 15 = 24 + 15 = 39
Class activity
Three teams score points (each between 10 and 30). The class finds the total by adding one score at a time.
Practice
1
22 + 5 + 12 = ?
39
2
10 + 24 + 33 = ?
67
3
3 + 4 + 2 + 30 = ?
39
4
A class has 12 girls and 14 boys; 2 new children join. How many now?
28