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Question

Identifying Strategies for Multi-Digit Addition
Strategy # 1: Counting up
27 + 4 = _
Counting up is useful when one of the numbers that you want to add is small, like 4.

Using 100 as an Anchor for addition

Strategy #2: Using _ as an Anchor
The Spanish club is planning a weekend trip. Each student will need to pay $36 for transportation and $98 for food and lodging. What is the total cost per student?

36
+98
------

_ < estimate
+100
--------
140

Write the problem horizontally.
36+98 98 is close to 100. Find a way to make 100.
break 36 into 34+2 34 + _ + 98
34 + 100 = _

Answer 1

Identifying Strategies for Multi-Digit Addition

Strategy #1: Counting up
27 + 4 = 31
Counting up is useful when one of the numbers that you want to add is small, like 4.

Using 100 as an Anchor for addition

Strategy #2: Using 100 as an Anchor
The Spanish club is planning a weekend trip. Each student will need to pay $36 for transportation and $98 for food and lodging. What is the total cost per student?

36
+98

_ < estimate
+100

140

Write the problem horizontally.
36 + 98. 98 is close to 100. Find a way to make 100.
Break 36 into 34 + 2: 34 + 2 + 98
34 + 100 = 134