# Problems Involving Adding and Subtracting within 1000: Difficult Problems with Solutions

By Catalin David
Problem 1
345 + 435 =
Problem 2
750 + 150 =
Problem 3
745 + 238 =
Problem 4
472 + 285 =
Problem 5
386 + 495 =
Problem 6
527 + 149 + 286 =
Problem 7
Find the perimeter of a triangle if its sides are:
120 cm, 394 cm, 278 cm.
Problem 8
Find the perimeter of a triangle with sides: 133, 202 and 147.
Problem 9
865 - 428 =
Problem 10
724 - 459 =

Problem 11
754 - 387 - 259 =
Problem 12
There are 460 bells in a souvenir storage. 135 are bronzed. 200 are glass bells and the rest are silver. How many are the silver bells?
Problem 13
256 + 183 + 344 + 217 =
Problem 14
526 - 289 + 274 - 311 =
Problem 15
There are 653 people on a train. At the first stop, 187 get off and 135 get on. How many people will be on the train?
Problem 16
What is the sum of all three-digit numbers whose sum of digits is 2?
Problem 17
The sum of even numbers from 243 to 248 is
Problem 18
The difference between the greatest even 3-digit number and the smallest odd 3-digit number is
Problem 19
The sum of even numbers between 243 and 247 is:
Problem 20
The sum of the smallest 3-digit number whose digits are even and consecutive and the smallest such number whose digits are odd and consecutive is
Problem 21
124 + 185 + 276 + 319 - 124 - 185 - 276 =

Correct:
Wrong:
Unsolved problems:
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