Addition Practice (4 Numbers up to 20)
Accuracy: 100%
Streak: 0
Adding 4 Numbers up to 20
Add four numbers where each can be up to 20 (like 17 + 9 + 13 + 6).
Student Tips:
- Group numbers that are easy to add: 17 + 9 + 13 + 6, try (17 + 13) + (9 + 6) = 30 + 15 = 45
- Break into 10s and 1s: (10 + 7) + 9 + (10 + 3) + 6 = 20 + (7 + 9 + 3 + 6) = 20 + 25 = 45
- Look for numbers that make round numbers: 9 + 6 = 15, 17 + 13 = 30, so 15 + 30 = 45
- Add in pairs, then add the pairs together
Teaching Instruction: Emphasize flexible grouping strategies. Use parentheses to show different groupings that give the same answer. Practice estimation first (about how much?). Show organization with place value charts for complex problems.
