## Mathematics essentials 11 Mental Math

**Specific Curriculum Outcomes**

**B1**know the multiplication and division facts

**B2**extend multiplication and division facts to products of tens, hundreds, and thousands by single-digit factors.

**B3**estimate sums and differences

**B4**estimate products and quotients

**B5**mentally calculate 25%, 33 1/3%, and 66 2/3% of quantities compatible with these percents

**B6**estimate percents of quantities

## Activities

**Tumblin' Dice**- It's not easy to find a copy of this game (and a bit expensive when you do), but I really liked this game for mental math as well as probability. If you've got a nice wood shop teacher at school, maybe they could make you a version. Or you could make your own version with styrofoam blocks or stacks of textbooks.