Early last month (for a high school lesson), we covered estimation with exponents (greater than 2) in EstHighPower. I recommend you review that topic if you haven't recently. Today we're going to back it off a notch for middle school, and we'll work on estimations where 2 is the highest exponent. This concept appeared 5 times last year, with a median placement at question # 40.
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Number Dojo Level: 163
These problems have several variations, which I will try to cover in the examples. In many cases, we will be asked to incorporate another skill into our calculation, such as AddSequence, Square11-20, or Square21-30.
* NOTE: When multiplying or squaring numbers ending in 0, it's a good idea to write the answer's (correct number of) zeros first. I do this for two reasons:
- I'm more likely to get the answer's number of digits correct, and
- I can dump those 0's out of my brain and work with smaller numbers to multiply or square.