← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 77 · 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. 1.39² =
  2. 2.49² =
  3. 3.89² =
  4. 4.89² =
  5. 5.71² =
  6. 6.31² =
  7. 7.81² =
  8. 8.19² =
  9. 9.19² =
  10. 10.31² =
  11. 11.91² =
  12. 12.61² =
  13. 13.61² =
  14. 14.81² =
  15. 15.19² =
  16. 16.21² =
  17. 17.29² =
  18. 18.81² =
  19. 19.81² =
  20. 20.19² =
  21. 21.21² =
  22. 22.79² =
  23. 23.79² =
  24. 24.49² =
  25. 25.81² =
  26. 26.71² =
  27. 27.79² =
  28. 28.31² =
  29. 29.91² =
  30. 30.61² =
  31. 31.39² =
  32. 32.41² =
  33. 33.19² =
  34. 34.21² =
  35. 35.39² =
  36. 36.81² =
  37. 37.81² =
  38. 38.59² =
  39. 39.39² =
  40. 40.41² =

Answer key

  1. 1521
  2. 2401
  3. 7921
  4. 7921
  5. 5041
  6. 961
  7. 6561
  8. 361
  9. 361
  10. 961
  11. 8281
  12. 3721
  13. 3721
  14. 6561
  15. 361
  16. 441
  17. 841
  18. 6561
  19. 6561
  20. 361
  21. 441
  22. 6241
  23. 6241
  24. 2401
  25. 6561
  26. 5041
  27. 6241
  28. 961
  29. 8281
  30. 3721
  31. 1521
  32. 1681
  33. 361
  34. 441
  35. 1521
  36. 6561
  37. 6561
  38. 3481
  39. 1521
  40. 1681

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