Curated OER
Missing Addends
Where are all the addends? Addition novices solve 36 equations by filling in the single-digit addend to achieve the given sum. They reference several examples, each of which include object sets to help learners visualize the concept....
Maths Blog
Make 20
There are quite a few ways to make the number 20 through addition. Learners fill in missing addends to reach the sum of 20 then answer additional related questions. This is a good resource because it has the class both add to 20 and...
Curated OER
Addition Up to 20, Sheet 3
Adding numbers up to sums of 20 is the focus of this learning exercise. Pupils complete a set of 24 problems by adding numbers to 20. A number line and reference website is given for additional activities.
Curated OER
Fact Families
There is something to be said for fact families. Classmates read problems and write related fact families and number sentences. There are 6 wonderful problems to solve.
Curated OER
Add up to 20
In this adding up to 20 instructional activity, students try to match each line of the rectangle to add up to 20 using any whole numbers they choose. Students have 6 blanks to fill in and 2 questions at the end.
Print and Practice
Adding to 20 With Andy
For this addition to 20 worksheet, students complete a set of 24 problems, adding 1 and 2-digit numbers with sums to 20. Answer key is included.