Page 31 - Start Up Mathematics_4

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Addition

Let’s Recall ...

• Addition means finding the total of two or more numbers. This total is
called sum.
• The numbers which are added are called addends.

• The sum of two numbers remains same even if the order of addends is changed.
• Adding 0 to a number gives the same number.
• Adding 1 to a number gives the next number.

• Any number except 1 can be written as the sum of two or more numbers in many
different ways.

1 Add the following numbers.

(a) 224 + 887 (b) 485 + 505 + 975 (c) 8,462 + 4,596 (d) 9,084 + 7,638

2 Add using expanded form.

(a) 376 + 958 (b) 1,632 + 4,789
(c) 2,691 + 350 (d) 132 + 5,701 + 3,526

3 Find the estimated sum of the following numbers by rounding off the numbers to the
nearest 100.

(a) 643 + 482 (b) 1,708 + 2,436
(c) 1,451 + 9,824 (d) 2,516 + 938 + 187

4 Sukrit travelled 1,578 km by train, 1,036 km by bus and another 729 km by car. How much
distance did he travel in his whole journey?

5 What number is 2,045 more than 6,287?

6 Fill in the blanks.

(a) 7,532 + 0 = _____________
(b) Sum of 438 and 527 is an ___________ number. (odd/even)
(c) 1,823 + 6,479 = ___________ + 1,823

(d) 9,987 + 100 = __________

Addition of Numbers (without carry over)
To add large numbers, first add the ones, then the tens, the hundreds, the thousands and
continue moving to the left.

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