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McGraw-Hill Math Grade 3 Answer Key Chapter 2 Lesson 2 Grouping Numbers to Add
Solve
Show two ways to group the addends. Use ( ).
Question 1.
12 + 2 + 3
12 + 2 + 3
Answer:
(12 + 2) + 3 and 12 + (2 + 3)
Add. Be sure to add the numbers in () first.
Question 2.
3 + 11 + 2
3 + 11 + 2
Answer:
(3 + 11) + 2
3 + (11 + 2)
Explanation:
(3 + 11) + 2
14 + 2 = 16
3 + (11 + 2)
3 + 13 = 16
So, 3 + 11 + 2 = 16.
Add. Be sure to add the number in ( ) first.
Question 3.
(14 + 1) + 2 =
___ + 2 = ____
14 + (1 + 2) =
14 + ___ = ____
Answer:
14 + 1 + 2 = 17
Explanation:
(14 + 1) + 2 =
15 + 2 = 17
14 + (1 + 2) =
14 + 3 = 17
So, 14 + 1 + 2 = 17.
Question 4.
4 + (2 + 10) =
4 + ___ = ___
(4 + 2) + 10 =
___ + 10 = ___
Answer:
4 + 2 + 10 = 16
Explanation:
4 + (2 + 10) =
4 + 12 = 16
(4 + 2) + 10 =
6 + 10 = 16
So, 4 + 2 + 10 = 16.