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  • Grade 1: Addition And Subtraction Within 20
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Grade 1 - Addition And Subtraction Within 20

total lessons: 19
NºActivity titletype

Relating Counting To Addition And Subtraction

G1.3.1
Adding by Counting On
G1.3.2
Skip-Counting by 2 to Add 2
G1.3.3
Subtracting by Counting Backward

Adding Within 20

G1.3.4
Adding Two 1-Digit Numbers by Making 10
G1.3.5
Adding Two 1-Digit Numbers Using Doubles Facts
G1.3.6
Adding Two 1-Digit Numbers Using Doubles Plus One Facts
G1.3.7
Adding Ones to 2-Digit Numbers by Grouping into 10 and Ones
G1.3.8
Adding Within 20: Games
G1.3.9
Doubles Facts: Games

Subtracting Within 20

G1.3.10
Subtracting 1-Digit Numbers from 2-Digit Numbers by Grouping into 10 and Ones, Then Subtracting the Ones
G1.3.11
Subtracting 1-Digit Numbers from 2-Digit Numbers by Grouping into 10 and Ones, Then Subtract from the 10
G1.3.12
Subtracting Within 20: Games

Word Problems Addition And Subtraction

G1.3.13
Solving Subtraction Problems Using Doubles Facts of Addition
G1.3.14
Solving One-Step Word Problems Involving Addition
G1.3.15
Solving One-Step Word Problems Involving Subtraction

Adding Three Numbers

G1.3.16
Adding Three 1-Digit Numbers Within 20
G1.3.17
Solving Word Problems Involving Addition of Three Numbers
G1.3.18
Solving Word Problems Involving Addition of Three 1-Digit Numbers Within 20
G1.3.19
Adding Three Numbers: Games