5
425
Yes
852
200
Composite
90
compatible numbers is just like to round or estimate a number. Ex: 44 the compatible number is to 40. because if the number less than five is rounded to the nearest ten (down). Ex: 56 the compatible number is 60. why? because a number greater than 5 is rounded up.
300+60=360
210 + 350 = 560
4.9095
Estimate 43/81 by using compatible numbers
11