Mental Math Strategy

Mental Math

Strategy 4

Read and Understand

Multiple Choice

999 rounded to the nearest thousand is?

• 990

• 900

• 1000

• 0

Multiple Choice

5673 + 1000 =

• 6673

• 3673

• 5573

• 5663

Multiple Choice

6673 - 1 =

• 6573

• 3673

• 5663

• 6672

Did you notice...

The THOUSANDS went up by one...



 while the UNITS went down by one.

Did you see?

1234 becomes 2233.

2491 becomes 3490

The thousand digit goes UP.
The unit/one digit goes DOWN

Are you ready to do it a bit faster now?

Try do it as fast as you can!