← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 626 · 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. 1.49² =
  2. 2.81² =
  3. 3.71² =
  4. 4.29² =
  5. 5.41² =
  6. 6.61² =
  7. 7.19² =
  8. 8.41² =
  9. 9.71² =
  10. 10.59² =
  11. 11.91² =
  12. 12.59² =
  13. 13.31² =
  14. 14.49² =
  15. 15.91² =
  16. 16.89² =
  17. 17.21² =
  18. 18.19² =
  19. 19.89² =
  20. 20.61² =
  21. 21.71² =
  22. 22.61² =
  23. 23.21² =
  24. 24.89² =
  25. 25.71² =
  26. 26.31² =
  27. 27.69² =
  28. 28.19² =
  29. 29.29² =
  30. 30.21² =
  31. 31.49² =
  32. 32.61² =
  33. 33.59² =
  34. 34.89² =
  35. 35.41² =
  36. 36.19² =
  37. 37.19² =
  38. 38.49² =
  39. 39.91² =
  40. 40.29² =

Answer key

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

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