Accessible Algorithms For Addition - Addition Cheat Sheet Page 2
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1
2Subtotals Method
Use with Houghton Mifflin Math, Ch 2, Lessons 3–4; Ch 11, Lesson 2.
This algorithm is helpful to students because it allows them to
break an addition problem into its components. The algorithm
provides students with a tool to solve problems in the direction
they read—from left to right.
Subtotals with Multi-Digit Addition
18,293
2,048
10,000
10,000
200
130
11
20,341
For less-advanced students, an optional transitional method that
shows place-value meanings is pictured below. Students can use
this method until they are comfortable moving towards the New
Groups Below Method or the Subtotals Method.
268
200
60
8
124
100
20
4
392
300
80
12
Subtotals with Decimal Addition
The Subtotals Method works equally well to develop
understanding of decimal addition.
4.517
2.824
6.000
1.300
0.030
0.011
7.341
Level 2
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