is almost 1, and 1 plus 27 equals 28. 172 plus 28 equals 200. N3D6TNp17
Answer to Problem 17:
Answers may vary. Examples: Since 23 is more than half of 41, she rounded up
171 to 172.
is almost 1, and 1 plus 27 equals 28. 172 plus 28 equals 200.
TEACHER NOTES:
In grades 6–8, students should acquire computational fluency—the ability to compute efficiently and accurately—with fractions, decimals, and integers. Teachers should help students learn how to decide when an exact answer or an estimate would be more appropriate, how to choose the best computational method to use, and how to evaluate the reasonableness of answers to computations.[1]
[1] National Council of Teachers of Mathematics. (2000). Principles and standards for school mathematics (p. 220). Reston, VA: Author.