Mangahigh
Mangahigh: Number: Number Partners Up to 20
Students explore the concept of number partners by working through an online tutorial and then attempting a ten question quiz that increases in difficulty as questions are answered correctly.
Khan Academy
Khan Academy: Find Missing Number (Add and Subtract Within 20)
Learn how to solve problems like "___ - 7 = 18" where you don't know one of the values in an addition or subtraction equation. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or...
BBC
Bbc Schools: Bitesize Revision Math Addition
This interactive activity has students practice number bonds to 10, 20, and 100. In addition to the online activity, there are teacher lesson plans and an online quiz on the topic.
Math Playground
Math Playground: Alien Addition
Practice your addition facts with this online game. Students can choose the range of addition facts to practice from 1 to 20.
Math Playground
Math Playground: Tug Boat Addition
Practice your addition facts for numbers 1-20 in this tug boat game.
Alabama Learning Exchange
Alex: Camp Add 'Em Up Iii
Camp Add 'Em Up is a series of lessons for first grade students. Students will use prior knowledge of friendly numbers (two number combinations that make a "10") and "adding on" as they master the ability to add three numbers. In this...
Khan Academy
Khan Academy: Add 10s and 100s (No Regrouping)
Practice solving problems like 344+20 and 344+200. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Teachnology
Teachnology: Addition and Subtraction Teaching Theme
Addition and Subtraction Math Theme provides an excellent collection of free sample worksheets, teacher resources, lesson plans and interactive media to support addition and subtraction skills.
Illustrative Mathematics
Illustrative Mathematics: Hitting the Target Number
The purpose of this task is to help young scholars develop flexible strategies for adding and subtracting within 20. Students will pick 5 number cards from pre-made cards labeled 1-10. Then, another student will pick a "target number"...
Khan Academy
Khan Academy: Word Problems With "More" and "Fewer" 2
Practice solving more word problems by finding how many more (or fewer) objects there are. Numbers used are 20 or less. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive...