← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 551 · 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. 1.31² =
  2. 2.81² =
  3. 3.59² =
  4. 4.21² =
  5. 5.81² =
  6. 6.29² =
  7. 7.79² =
  8. 8.71² =
  9. 9.19² =
  10. 10.79² =
  11. 11.91² =
  12. 12.49² =
  13. 13.91² =
  14. 14.81² =
  15. 15.19² =
  16. 16.59² =
  17. 17.89² =
  18. 18.49² =
  19. 19.61² =
  20. 20.89² =
  21. 21.41² =
  22. 22.49² =
  23. 23.51² =
  24. 24.61² =
  25. 25.71² =
  26. 26.71² =
  27. 27.79² =
  28. 28.89² =
  29. 29.61² =
  30. 30.49² =
  31. 31.91² =
  32. 32.21² =
  33. 33.71² =
  34. 34.19² =
  35. 35.81² =
  36. 36.81² =
  37. 37.79² =
  38. 38.61² =
  39. 39.69² =
  40. 40.49² =

Answer key

  1. 961
  2. 6561
  3. 3481
  4. 441
  5. 6561
  6. 841
  7. 6241
  8. 5041
  9. 361
  10. 6241
  11. 8281
  12. 2401
  13. 8281
  14. 6561
  15. 361
  16. 3481
  17. 7921
  18. 2401
  19. 3721
  20. 7921
  21. 1681
  22. 2401
  23. 2601
  24. 3721
  25. 5041
  26. 5041
  27. 6241
  28. 7921
  29. 3721
  30. 2401
  31. 8281
  32. 441
  33. 5041
  34. 361
  35. 6561
  36. 6561
  37. 6241
  38. 3721
  39. 4761
  40. 2401

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