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Adding 100

When we add '100' to a number, the value of the digit at the hundreds place increases by
1 and tens and ones digits remain the same.

examples: (a) 643 + 100 = 743 (b) 1785 + 100 = 1885
Adding 1000

When we add '1000' to a number, the value of the digit at the thousands place increases

by 1 and hundreds, tens and ones digits remain the same.

examples: (a) 6523 + 1000 = 7523 (b) 7092 + 1000 = 8092

Remember
In case the digit at the tens, hundreds or thousands place is 9, while adding 10, 100 or 1000
respectively, the digit at the next highest place also changes.
For example, (i) 91 + 10 = 101 (ii) 8965 + 100 = 9065

practice time 2F

1. Fill in the blanks using the properties of addition.

(a) 124 + 0 = ______ (b) _____ + 0 = 675 (c) 8926 + ____ = 8926
(d) 4678 + 1 = ______ (e) 3564 + _____ = 3565 (f) _______+ 1 = 4576

2. Find the missing numbers.

(a) 74 + ____ = 84 (b) ____ + 55 = 65 (c) 4362 + ____ = 4462

(d) ____ + 5346 = 5446 (e) 3040 + ____ = 3140 (f) ____ + 1736 = 2736

3. Find the sum of the following using the properties of addition.
(a) 542 + 10 (b) 789 + 100 (c) 10 + 7235

(d) 4178 + 100 (e) 6965 + 100 (f) 6743 + 100

(g) 100 + 3144 (h) 612 + 1000 (i) 6283 + 1000

4. Add the following numbers. then, change the order of the addends to verify the
order property of the addition.

(a) 635 + 298 (b) 563 + 375

H t O H t O H t O H t O

+ + + +

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