Create your own centimeter ruler. Then, estimate and measure with lengths with it. Warm up with a Mystery Math Mistake as you add two 2-digit numbers using a decomposition strategy. Think through ...

Quick: How many people did you see on the way home from work the other day? Was it more or less than the day before? Regardless of your answer, it's likely you can't explain what led you to it. Number ...

Making a sensible guess or a rough calculation is known as estimation. An estimate is not an exact calculation. You can use estimation when you do not need to know an exact number or you can use it to ...

It's easy to not think about how little expenses add up over the course of an entire year. Use this simple mental calculation to quickly estimate the yearly expense and think about what better use ...

Estimating means making numbers simpler but keeping their value close to what it was. The result is not exact, but it gives an idea of what the total will be. There are steps which can be followed to ...

Preschool children who showed less ability to estimate the number of objects in a group were 2.4 times more likely to have a later mathematical learning disability than other young people, according ...