Lesson 2: Word problem addition with three numbers that sum less than or equal to 20
https://teachablemath.com/teaching-addition-and-subtraction-for-numbers-to-20/
Why this is useful:
The resource above explains strategies for adding three numbers within 20, including how to break numbers apart, use gestures/manipulatives, and visualize combinations of three addends. It aligns well with the objective because it gives parents concrete insight into how to support their child’s thinking (imagine, represent, solve) rather than just what answer to pick.
What to do:
Read the explanation of the different strategies provided
After reading, choose a few simple examples
Encourage the child to draw or tap the three numbers in sequence
Talk through an example in a real-life context: e.g., “Imagine you have 3 red marbles, 6 green marbles, and 4 blue marbles — how many marbles in total?”
After doing a few together, the parent can encourage the child to try the online activity you shared (the spinner/MathGames link) and apply the same visual/tapping/drawing strategy.