PIMSO 2022 - Mathematics - Grade 4 - National Round Question 13

Simplify: 27,111 + 25,212 + 23,313 + 21,414 + 19,515 + 17,616 + 15,717 + 13,318 + 11,419 + 9,520 + 7,621 + 5,722 + 3,823 + 1,924