← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 95 · 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. 1.89² =
  2. 2.49² =
  3. 3.71² =
  4. 4.19² =
  5. 5.39² =
  6. 6.81² =
  7. 7.91² =
  8. 8.29² =
  9. 9.19² =
  10. 10.49² =
  11. 11.21² =
  12. 12.79² =
  13. 13.21² =
  14. 14.19² =
  15. 15.29² =
  16. 16.61² =
  17. 17.71² =
  18. 18.79² =
  19. 19.31² =
  20. 20.31² =
  21. 21.81² =
  22. 22.41² =
  23. 23.61² =
  24. 24.39² =
  25. 25.71² =
  26. 26.31² =
  27. 27.69² =
  28. 28.69² =
  29. 29.19² =
  30. 30.59² =
  31. 31.49² =
  32. 32.71² =
  33. 33.19² =
  34. 34.79² =
  35. 35.61² =
  36. 36.19² =
  37. 37.71² =
  38. 38.79² =
  39. 39.29² =
  40. 40.49² =

Answer key

  1. 7921
  2. 2401
  3. 5041
  4. 361
  5. 1521
  6. 6561
  7. 8281
  8. 841
  9. 361
  10. 2401
  11. 441
  12. 6241
  13. 441
  14. 361
  15. 841
  16. 3721
  17. 5041
  18. 6241
  19. 961
  20. 961
  21. 6561
  22. 1681
  23. 3721
  24. 1521
  25. 5041
  26. 961
  27. 4761
  28. 4761
  29. 361
  30. 3481
  31. 2401
  32. 5041
  33. 361
  34. 6241
  35. 3721
  36. 361
  37. 5041
  38. 6241
  39. 841
  40. 2401

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