90 Speed Math for Kids
Th e calculation now looks like this:
(100 × 3) 96 × 289 =
–4
–11
–12
Subtract 12 from 289.
289 – 12 = 277
Multiply 277 by the main reference number, 100.
277 × 100 = 27,700
Now multiply the numbers in the original circles (4 and 11).
4 × 11 = 44
Add 44 to 27,700 to get 27,744. Th is can easily be calculated in
your head with just a little practice.
Th e full calculation looks like this:
(100 × 3) 96 × 289 = 27,700
–4
–11
- 44
–12 27,744 Answer
Th e calculation part of the problem is easy. Th e only diffi culty you
may have is remembering what you have to do next.
If the numbers are above the reference numbers, we do the calculation
as follows. We will take 12 × 124 as an example:
(10 × 12) 12 × 124 =
We choose 10 and 120 as reference numbers. Because the numbers
we are multiplying are both above the reference numbers, we draw