← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 343 · 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. 1.19² =
  2. 2.59² =
  3. 3.21² =
  4. 4.49² =
  5. 5.69² =
  6. 6.79² =
  7. 7.91² =
  8. 8.71² =
  9. 9.41² =
  10. 10.39² =
  11. 11.39² =
  12. 12.39² =
  13. 13.59² =
  14. 14.71² =
  15. 15.39² =
  16. 16.41² =
  17. 17.59² =
  18. 18.19² =
  19. 19.69² =
  20. 20.69² =
  21. 21.81² =
  22. 22.89² =
  23. 23.49² =
  24. 24.89² =
  25. 25.81² =
  26. 26.21² =
  27. 27.19² =
  28. 28.49² =
  29. 29.79² =
  30. 30.29² =
  31. 31.31² =
  32. 32.19² =
  33. 33.29² =
  34. 34.19² =
  35. 35.89² =
  36. 36.69² =
  37. 37.91² =
  38. 38.41² =
  39. 39.21² =
  40. 40.79² =

Answer key

  1. 361
  2. 3481
  3. 441
  4. 2401
  5. 4761
  6. 6241
  7. 8281
  8. 5041
  9. 1681
  10. 1521
  11. 1521
  12. 1521
  13. 3481
  14. 5041
  15. 1521
  16. 1681
  17. 3481
  18. 361
  19. 4761
  20. 4761
  21. 6561
  22. 7921
  23. 2401
  24. 7921
  25. 6561
  26. 441
  27. 361
  28. 2401
  29. 6241
  30. 841
  31. 961
  32. 361
  33. 841
  34. 361
  35. 7921
  36. 4761
  37. 8281
  38. 1681
  39. 441
  40. 6241

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