← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 60 · 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. 2.19² =
  3. 3.19² =
  4. 4.59² =
  5. 5.21² =
  6. 6.31² =
  7. 7.81² =
  8. 8.21² =
  9. 9.19² =
  10. 10.89² =
  11. 11.19² =
  12. 12.69² =
  13. 13.59² =
  14. 14.19² =
  15. 15.71² =
  16. 16.69² =
  17. 17.59² =
  18. 18.31² =
  19. 19.59² =
  20. 20.59² =
  21. 21.59² =
  22. 22.69² =
  23. 23.21² =
  24. 24.29² =
  25. 25.21² =
  26. 26.41² =
  27. 27.21² =
  28. 28.69² =
  29. 29.41² =
  30. 30.79² =
  31. 31.79² =
  32. 32.31² =
  33. 33.59² =
  34. 34.21² =
  35. 35.19² =
  36. 36.49² =
  37. 37.49² =
  38. 38.91² =
  39. 39.29² =
  40. 40.59² =

Answer key

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

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