32
Parts of an addition
Textbook Part 1, pp. 66–67
GoalKnow and use the words addend and sum.
New words
addend · qo‘shiluvchisum · yig‘indifirst / second addend · birinchi / ikkinchi qo‘shiluvchi
Explanation
In an addition each number has a name: in 3 + 4 = 7, 3 is the first addend, 4 is the second addend and 7 is the sum. The expression “3 + 4” itself is also called a sum. Addend + addend = sum.
Worked examples
A computer program: first number 5, second number 2 → 7. The program added: 5 + 2 = 7.
Addends 6 and 3 → sum 9.
Class activity
Fill a table: “1st addend | 2nd addend | sum”. Children take turns filling the blank boxes on the board.
Practice
1
Addends 4 and 5. Sum?
9
2
In 2 + 6 = 8, which number is the sum?
8
3
Aziz wrote: 2 + 5 = 8. Correct the mistake.
2 + 5 = 7
4
The numbers on each side of a triangle must add up to 10. One side: 3, _, 5.
2