Difficult

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

By Catalin David
Problem 1
625 - [625 - (247 + 156)] =
Problem 2
125 + 135 + 145 + 155 + 165 + 175 =
Problem 3
Calculate
213 + 321 + 462 + 543 - 212 - 320 - 461 - 542
Problem 4
Tim has \$683. If he gives Matt \$324, then they will both have the same amount of money. How much money did Matt have before?
Problem 5
90 toys were sold in the first day at a shop. In each of the following three days, 74 more toys were sold than the day before. What's the number of toys sold in the 4 days?
Problem 6
Can we build a triangle whose sides are 185 cm, 378 cm and 563 cm?
Difficult

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