BEATCALC: Beat the Calculator!

Back to Math Tips & Tricks

Faster than a speeding calculator!

1. Squaring a 2-digit number beginning with 5
2. Squaring a 2-digit number beginning with 9
3. Squaring a 2-digit number ending in 1
4. Squaring a 2-digit number ending in 2
5. Squaring a 2-digit number ending in 3
6. Squaring a 2-digit number ending in 4
7. Squaring a 2-digit number ending in 5
8. Squaring a 2-digit number ending in 6
9. Squaring a 2-digit number ending in 7
10. Squaring a 2-digit number ending in 8
11. Squaring a 2-digit number ending in 9
12. Squaring numbers made up of ones
13. Squaring numbers made up of threes
14. Squaring numbers made up of sixes
15. Squaring numbers made up of nines
16. Squaring numbers in the twenties
17. Squaring numbers in the hundreds
18. Squaring numbers in the nine hundreds
19. Squaring numbers between 1000 and 1100
20. Squaring special numbers (3's and final 1)
21. Squaring special numbers (3's and final 2)
22. Squaring special numbers (3's and final 4)
23. Squaring special numbers (3's and final 5)
24. Squaring special numbers (3's and final 6)
25. Squaring special numbers (6's and final 7)
26. Squaring special numbers (9's and final 1)
27. Squaring special numbers (9's and final 2)
28. Squaring special numbers (9's and final 4)
29. Squaring special numbers (9's and final 7)
30. Squaring special numbers (1 and repeating 3's)
31. Squaring a repeating 6-digit number
32. Multiplying two selected 2-digit numbers (same 1st digit) [1]
33. Multiplying two selected 2-digit numbers (same 1st digit) [2]
34. Multiplying two selected 2-digit numbers (same 2nd digit)
35. Multiplying two selected 3-digit numbers (middle digit 0)
36. Multiplying two selected 3-digit numbers (middle digit 1)
37. Multiplying two selected 3-digit numbers (middle digit 2)
38. Multiplying two selected 3-digit numbers (middle digit 3)
39. Multiplying two selected 3-digit numbers (middle digit 4)
40. Multiplying two selected 3-digit numbers (middle digit 5)
41. Multiplying two 2-digit numbers with a difference of 1
42. Multiplying two 2-digit numbers with a difference of 2
43. Multiplying two 2-digit numbers with a difference of 3
44. Multiplying two 2-digit numbers with a difference of 4
45. Multiplying two 2-digit numbers with a difference of 6
46. Multiplying two 2-digit numbers with a difference of 8
47. Multiplying two 2-digit numbers with a difference of 10
48. Multiplying a 2-digit number by 12 1/2
49. Multiplying a 2-digit number by 15
50. Multiplying a 2-digit number by 18
51. Multiplying a 2-digit number by 27
52. Multiplying a 2-digit number by 33 1/3
53. Multiplying a 2-digit number by 36
54. Multiplying a 2-digit number by 45
55. Multiplying a 2-digit number by 55
56. Multiplying a 2-digit number by 63
57. Multiplying a 2-digit number by 72
58. Multiplying a 2-digit number by 81
59. Multiplying a 2-digit number by 99
60. Multiplying a 3-digit number by 99
61. Multiplying a 2-digit number by 198
62. Multiplying a 2-digit number by 297
63. Multiplying a 2-digit number by 396
64. Multiplying a 2-digit number by 495
65. Multiplying a 2-digit number by 594
66. Multiplying a 2-digit number by 693
67. Multiplying a 2-digit number by 792
68. Multiplying a 2-digit number by 891
69. Multiplying a 2-digit number by 999
70. Multiplying a 2- or 3-digit number by 75
71. Multiplying a 2- or 3-digit number by 101
72. Multiplying a 2- or 3-digit number by 1001 and adding 21 (or 201)
73. Multiplying a 2-, 3-, or 4-digit number by 10001 and adding 21, 201, or 2001
74. Multiplying a 2-, 3-, 4-, or 5-digit number by 100001
75. Multiplying a 2- or 3-digit number by 1 2/3
76. Multiplying a 2- or 3-digit number by 2 1/2
77. Multiplying a 2-digit number by 3 1/3
78. Multiplying a 2- or 3-digit number by 16 2/3
79. Multiplying a 2- or 3-digit number by 25
80. Multiplying a repeating 3-digit number by 2, then dividing it by 37
81. Multiplying a repeating 3-digit number by 5, then dividing it by 37
82. Multiplying a repeating 9-digit number by 3, then dividing it by 12345679
83. Multiplying a multi-digit number by 8 and adding the last digit
84. Multiplying a number sequence by 8, adding a number, and subtracting 20
85. Multiplying the sum and the difference of a 2-digit and a 1-digit number
86. Multiplying two mixed numbers
87. Multiplying a 4-digit number by 99
88. Multiplying a 4-digit number by 137 and then 73
89. Dividing a 2-digit number by 1 1/2
90. Dividing a 2-digit number by 1 2/3
91. Dividing a 2- or 3-digit number by 2 1/2
92. Dividing a 2- or 3-digit number by 3 1/3
93. Dividing a 2-digit number by 12 1/2
94. Dividing a 2-digit number by 15
95. Dividing a 2- or 3-digit number by 16 2/3
96. Dividing a 2- or 3-digit number by 33 1/3
97. Dividing a 2- or 3-digit number by 25
98. Dividing a repeating 3-digit number by 37 and adding 41
99. Dividing a repeating 6-digit number by 15873
100. Dividing a repeating 6-digit number by 7, then by 13
101. Dividing a repeating 6-digit number by 13, then by 11
102. Dividing a repeating 6-digit number by 7, 11, and 13, then subtracting 101
103. Dividing a repeating 6-digit number by 37037, then multiplying by 5
104. Dividing mixed numbers by 2
105. Finding the difference of the squares of two consecutive 2-digit numbers
106. Finding the difference of the squares of two different 2-digit numbers
107. Finding the sum of all even numbers from 2 through a selected 2-digit even number
108. Adding a sequence of consecutive odd numbers
109. Adding consecutive numbers between two numbers
110. Adding a sequence of numbers from one to a selected 2-digit number
111. Adding sequences of numbers in the 50's
112. Adding sequences of numbers in the 80's
113. Adding a series of doubles
114. Adding a series of quadruples
115. Adding a series of ten numbers
116. Subtracting from a repeating 1's number, dividing by 9, subtracting 21
117. Subtracting from a repeating 8's number, dividing by 9, subtracting 10
118. Subtracting the squares of two numbers
119. Reversing/adding/subtracting 3-digit numbers
120. Finding 2.5 percent of a number
121. Finding 5 percent of a number

Calculation Practice Exercises