← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 842 · 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. 1.91² =
  2. 2.59² =
  3. 3.41² =
  4. 4.81² =
  5. 5.39² =
  6. 6.61² =
  7. 7.61² =
  8. 8.41² =
  9. 9.59² =
  10. 10.41² =
  11. 11.89² =
  12. 12.61² =
  13. 13.71² =
  14. 14.59² =
  15. 15.39² =
  16. 16.39² =
  17. 17.89² =
  18. 18.81² =
  19. 19.69² =
  20. 20.21² =
  21. 21.41² =
  22. 22.69² =
  23. 23.81² =
  24. 24.59² =
  25. 25.79² =
  26. 26.89² =
  27. 27.21² =
  28. 28.59² =
  29. 29.19² =
  30. 30.69² =
  31. 31.19² =
  32. 32.91² =
  33. 33.49² =
  34. 34.81² =
  35. 35.91² =
  36. 36.29² =
  37. 37.71² =
  38. 38.21² =
  39. 39.21² =
  40. 40.39² =

Answer key

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

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