Phase 1 Challenge — Make-10/20 & Near Doubles

Bridge to 20; show hops or part-part-whole.

  1. 18 + 5 = ____ (bridge)
  2. 16 − 7 = ____ (use make-10 idea)
  3. Near double: 9 + 8 = ____
  4. Make 20: 13 + ____ = 20
  5. Keeper task: 19 fish, add 6 more. Total? ____
  6. Subtract: 20 − 9 = ____
  7. Part-part-whole: 17 = ____ + ____ (two ways)
  8. Double then adjust: 8 + 9 = ____
  9. Story: 14 birds, 7 fly away. Left? ____
  10. Skip count 5s from 5 (six numbers): 5, __, __, __, __, __, __

Phase 1 Challenge — Mixed Problems

Choose a strategy, explain with a quick sketch.

  1. 7 + 14 = ____
  2. 12 + 9 = ____
  3. 20 − 13 = ____
  4. 15 − 6 = ____
  5. 10 + 10 + 3 = ____
  6. Make 10 twice: 9 + 6 + 5 = ____
  7. Near double: 11 + 10 = ____
  8. Counting back: 19 − 4 = ____
  9. Extend: 18 + 7 = ____ (bridge to 20)
  10. Zoo story: 13 kākāriki fed, 5 more arrive. Total? ____