← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 22 · 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. 1.31² =
  2. 2.89² =
  3. 3.21² =
  4. 4.71² =
  5. 5.69² =
  6. 6.19² =
  7. 7.39² =
  8. 8.21² =
  9. 9.31² =
  10. 10.39² =
  11. 11.21² =
  12. 12.79² =
  13. 13.59² =
  14. 14.79² =
  15. 15.29² =
  16. 16.21² =
  17. 17.31² =
  18. 18.91² =
  19. 19.69² =
  20. 20.19² =
  21. 21.19² =
  22. 22.79² =
  23. 23.71² =
  24. 24.81² =
  25. 25.61² =
  26. 26.79² =
  27. 27.69² =
  28. 28.21² =
  29. 29.49² =
  30. 30.69² =
  31. 31.31² =
  32. 32.89² =
  33. 33.49² =
  34. 34.91² =
  35. 35.79² =
  36. 36.79² =
  37. 37.51² =
  38. 38.31² =
  39. 39.59² =
  40. 40.81² =

Answer key

  1. 961
  2. 7921
  3. 441
  4. 5041
  5. 4761
  6. 361
  7. 1521
  8. 441
  9. 961
  10. 1521
  11. 441
  12. 6241
  13. 3481
  14. 6241
  15. 841
  16. 441
  17. 961
  18. 8281
  19. 4761
  20. 361
  21. 361
  22. 6241
  23. 5041
  24. 6561
  25. 3721
  26. 6241
  27. 4761
  28. 441
  29. 2401
  30. 4761
  31. 961
  32. 7921
  33. 2401
  34. 8281
  35. 6241
  36. 6241
  37. 2601
  38. 961
  39. 3481
  40. 6561

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