Grade 2 · Math · Lesson 9

Add 2- and 3-Digit Numbers

Adding means finding out how many there are altogether. One of the best ways to add is to use a number line — start at the first number and hop forward by the second number.

What this lesson teaches

1Add 2- and 3-digit numbers by hopping forward on a number line
2Use the words addend and sum correctly
3Add by ones, tens, and hundreds to find the total

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