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Lesson: Adding Ones to Two-Digit Numbers with Regrouping Mathematics • 1st Grade

In this lesson, we will learn how to add a one-digit number to a two-digit number when crossing a ten and model this with place value equipment.

Lesson Plan

Students will be able to

use place value models to regroup ones,
use place value models to add a one-digit number and a two-digit number with regrouping,
draw models to add a one-digit number and a two-digit number with regrouping.

Q1:

Make a ten to find .

Q2:

James has 69 marbles. His friend gives him 4 more. How many marbles does he have now?

Q3:

Calculate .

Tip: Use the place value blocks if you need to.