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.
Skills Practiced
- Adding four numbers that are each 20 or less
- Grouping numbers that make 10s or round numbers, like 17 + 13 = 30
- Adding in pairs, then combining the pairs
- Using mental math and estimation to check sums
