Add Numbers using Decomposition
New York State Common Core Math Grade 1, Module 6, Lessons 13
Worksheets for First GradeWorksheets, solutions, and videos to help Grade 1 students learn how to add a pair of two-digit numbers when the ones digits have a sum greater than 10 using decomposition.
Common Core Standards: 1.NBT.4, 1.NBT.6
Topic C: Addition to 100 Using Place Value Understanding
Lesson 13 Concept Development
Learning Goal: I can use different strategies to add 2-digit numbers.
1. Solve and show your work.
a. 15 + 26 = _______
b. 46 + 49 = _______
c. 28 + 54 = _______
d. 69 + 13 = _______
e. 69 + 23 = _______
f. 69 + 19 = _______
g. 49 + 43 = _______
h. 67 + 36 = _______
i. 68 + 23 = _______
2. Solve and show your work.
a. 34 + 47 = _______
b. 38 + 45 = _______
c. 68 + 23 = _______
d. 39 + 57 = _______
e. 38 + 44 = _______
f. 17 + 76 = _______
g. 68 + 24 = _______
h. 18 + 77 = _______
i. 14 + 67 = _______
Lesson 14 Homework
1. Solve and show your work.
a. 68 + 21 = ____
b. 59 + 32 = ____
c. 39 + 44 = ____
d. 58 + 36 = ____
e. 76 + 17 = ____
f. 68 + 26 = ____
g. 56 + 39 = ____
h. 58 + 39 = ____
2. Solve and show your work.
a. 39 + 41 = ____
b. 48 + 43 = ____
c. 87 + 13 = ____
d. 59 + 25 = ____
e. 65 + 27 = ____
f. 27 + 67 = ____
g. 49 + 39 = ____
h. 38 + 58 = ____
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