Mental Math Worksheets Grade 3

1. A rectangular garden is divided into square plots. There are 8 rows of plots and 7 columns of plots. If each square plot has an area of 9 square meters, what is the total area of the garden?
2. 503 - 297 = ?
3. Liam is organizing his baseball card collection. He has 8 pages in his binder and can fit 9 cards on each page. How many baseball cards can Liam fit in his binder in total?

…and 4 more problems

1. Noah is building a treehouse and needs to buy wood planks. Each plank costs $15. If Noah has saved $245 from his allowance, how many planks can he buy?
2. Liam is collecting trading cards. He has 48 cards in his collection. For his birthday, his friend Noah gives him a pack with 25 new cards. How many trading cards does Liam have now?
3. 497 + 256 = ?

…and 4 more problems

1. A rectangular soccer field is drawn on a grid. The field is 60 meters long and 40 meters wide. If you run along the entire outside edge of the field, what total distance will you run?
2. 798 + 156 = ?
3. A rectangular playground is drawn on a grid. The playground is 45 meters long and 32 meters wide. If you run along the entire outside edge of the playground, what total distance will you run?

…and 2 more problems