← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 73 · 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. 2.39² =
  3. 3.81² =
  4. 4.59² =
  5. 5.71² =
  6. 6.69² =
  7. 7.19² =
  8. 8.19² =
  9. 9.39² =
  10. 10.29² =
  11. 11.29² =
  12. 12.41² =
  13. 13.41² =
  14. 14.69² =
  15. 15.39² =
  16. 16.49² =
  17. 17.39² =
  18. 18.89² =
  19. 19.91² =
  20. 20.69² =
  21. 21.69² =
  22. 22.19² =
  23. 23.91² =
  24. 24.41² =
  25. 25.59² =
  26. 26.71² =
  27. 27.49² =
  28. 28.81² =
  29. 29.21² =
  30. 30.89² =
  31. 31.41² =
  32. 32.79² =
  33. 33.89² =
  34. 34.49² =
  35. 35.29² =
  36. 36.31² =
  37. 37.39² =
  38. 38.79² =
  39. 39.61² =
  40. 40.19² =

Answer key

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

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