Unit 2 · Number Theory
11 of Each Place Value — What Is the Sum?
Lesson 7 of 15
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About this lesson
11 thousands + 11 hundreds + 11 tens + 11 ones = 11000 + 1100 + 110 + 11 = 12,221. The key mistake (option A = 11,111) comes from thinking each digit place just gets an '11', forgetting the column additions carry over into adjacent places.
Chapters
0:00Introduction
0:24The Question
1:00Unpacking and translating the components
1:28Aligning the vertically stacked columns
1:56Executing the column addition
2:43Exam strategy — the visual overlap trap
3:41Confirming the final option
Question
What number do you get if you add 11 thousands, 11 hundreds, 11 tens and 11 ones?
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