🌟🌟🌟 Level 3 • Abacus Young Star

Overall Revision of 16 Formulas

Practise all 8 small friend and 8 big friend formulas

📚 All 16 Formulas — Quick Reference

💡 These are all 16 formulas you have learned across Levels 1, 2 and 3. Use the correct formula for each problem!

👑 Small Friends (Complement of 5)

+1 = +5 −4
+2 = +5 −3
+3 = +5 −2
+4 = +5 −1
−1 = −5 +4
−2 = −5 +3
−3 = −5 +2
−4 = −5 +1

🌟 Big Friends (Complement of 10)

+1 = +10 −9
+2 = +10 −8
+3 = +10 −7
+4 = +10 −6
+5 = +10 −5
+6 = +10 −4
+7 = +10 −3
+8 = +10 −2
+9 = +10 −1

✎ Mixed Practice — All 16 Formulas

Use the correct formula for each addition problem:

0/20

← Back to Practice Dashboard  •  View Full Young Star Level 3 Syllabus