This calculator is useful for checking the level of attention of pupils.

For some operations, programmed, it gives incorrect results that few are aware of.

Sneaky Calculator's Word Problems: check attention

A square measures mt.120 x 80. Find its perimeter.

Solution: 120 x 2 + 80 ÷ 2 = 400; but the display shows 600.

€ 1,348 worth of tickets were sold at the carnival. If tickets cost 4 for € 1, how many tickets were sold?

Solution: 1,348 x 4 = 5,392; but the display shows that 6,390 tickets were sold.

You can earn € 8 a day by cutting the grass. How many days will it take you to earn € 184?

Solution:184 ÷ 8 = 23 days; but the display shows 27.

You had € 1 million, but then you spent € 999 and then € 22,222. How much money do you have left?

Solution: 1,000,000 - 999 - 22,222 = 976,779; but the display shows that you have only € 956,777 left.

It takes 4 apples to make 1 pie. How many apples does it take to make 504 pies?

Solution: 4 x 504 = 2,016; but the display shows that you need 2,416 apples.