← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 403 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.81² =
  2. 2.49² =
  3. 3.81² =
  4. 4.51² =
  5. 5.69² =
  6. 6.49² =
  7. 7.19² =
  8. 8.51² =
  9. 9.89² =
  10. 10.89² =
  11. 11.49² =
  12. 12.51² =
  13. 13.89² =
  14. 14.41² =
  15. 15.59² =
  16. 16.59² =
  17. 17.59² =
  18. 18.51² =
  19. 19.21² =
  20. 20.19² =
  21. 21.71² =
  22. 22.19² =
  23. 23.79² =
  24. 24.49² =
  25. 25.39² =
  26. 26.91² =
  27. 27.51² =
  28. 28.51² =
  29. 29.59² =
  30. 30.81² =
  31. 31.49² =
  32. 32.21² =
  33. 33.91² =
  34. 34.49² =
  35. 35.91² =
  36. 36.79² =
  37. 37.21² =
  38. 38.79² =
  39. 39.71² =
  40. 40.61² =

Answer key

  1. 6561
  2. 2401
  3. 6561
  4. 2601
  5. 4761
  6. 2401
  7. 361
  8. 2601
  9. 7921
  10. 7921
  11. 2401
  12. 2601
  13. 7921
  14. 1681
  15. 3481
  16. 3481
  17. 3481
  18. 2601
  19. 441
  20. 361
  21. 5041
  22. 361
  23. 6241
  24. 2401
  25. 1521
  26. 8281
  27. 2601
  28. 2601
  29. 3481
  30. 6561
  31. 2401
  32. 441
  33. 8281
  34. 2401
  35. 8281
  36. 6241
  37. 441
  38. 6241
  39. 5041
  40. 3721

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths