Without using a calculator, can you figure out which product will be greater: 27 x 39 or 28 x 38?
Solution:
Think about 28 x 39...
- For 27 x 39 you would need to add another group of 39.
- For 28 x 38 you would only need to add another group another group of 28.
- This means that 28 x 38 is larger.
Which is larger 134 x 215 or 135 x 214? How much larger?
Department