Mathematics
Grade-2
Easy
Question
Use partial sums to find the sum of 18 and 42.
- 50
- 60
- 70
- 80
Hint:
To find partial sums add the digits in tens place and ones place separately.
Place value is the value of each digit in a number. For example, the 5 in 350 represents 5 tens, or 50; however, the 5 in 5,006 represents 5 thousands, or 5,000. It is important that children understand that whilst a digit can be the same, its value depends on where it is in the number.
The correct answer is: 60
To find partial sums add the digits in tens place and ones place separately.
Partial sum of 18 + 42
Step 1 : Add digits in tens and ones place separately:
10 08
+ 40 and + 02
_____ ______
50 10
Thus, the sum of 18 + 42 are 50 + 10 = 60.
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