Answers:
- Estimate = 20,000 (underestimate)
- Actual product = 21,285
Step-by-step explanation
4257 is close to 4000
5x4 = 20 which means 5x4000 = 20,000 is an estimate. It is an underestimate because 4000 is below 4257.
Here is one way we can find the actual product.
5x4257 = 5x(4000+200+50+7)
5x4257 = 5x4000+5x200+5x50+5x7
5x4257 = 20,000+1,000+250+35
5x4257 = 21,285 is the actual product
I used the distributive property on the second step.