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5th Grade Mental Math IV
- 23. 30 x 4 is 120
and 2 x 4 is 8
and 120 + 8 gives
a sum of 128
- 25. 50 x 2 is 100
and 4 x 2 is 8
and 100 + 8 gives
a sum of 108
- 27. 90 x 3 is 270
and 1 x 3 is 3
and 270 + 3 gives
a sum of 273
- 29. 20 x 5 is 100
and 8 x 5 is 40
and 100 + 40 gives
a sum of 140
- 31. 60 x 5 is 300
and 3 x 5 is 15
and 300 + 15 gives
a sum of 315
- 33. 70 x 2 is 140
and 7 x 2 is 14
and 140 + 14 gives
a sum of 154
- 35. 80 x 4 is 320
and 6 x 4 is 24
and 320 + 24 gives
a sum of 344
- 37. 30 x 5 is 150
and 6 x 5 is 30
and 150 + 30 gives
a sum of 180
- 39. 40 x 8 is 320
and 1 x 8 is 8
and 320 + 8 gives
a sum of 328
- 41. 30 x 4 is 120
and 9 x 4 is 36
and 120 + 36 gives
a sum of 156
- 43. 20 x 8 is 160
and 5 x 8 is 40
and 160 + 40 gives
a sum of 200
- 45. 60 x 7 is 420
and 6 x 7 is 42
and 420 + 42 gives
a sum of 462
- 47. 90 x 3 is 270
and 6 x 3 is 18
and 270 + 18 gives
a sum of 288
- 49. 40 x 4 is 160
and 7 x 4 is 28
and 160 + 28 gives
a sum of 188
- 51. 20 x 8 is 160
and 1 x 8 is 8
and 160 + 8 gives
a sum of 168
- 53. 70 x 5 is 350
and 4 x 5 is 20
and 350 + 20 gives
a sum of 370
- 55. 50 x 6 is 300
and 8 x 6 is 48
and 300 + 48 gives
a sum of 348
- 57. 30 x 7 is 210
and 8 x 7 is 56
and 210 + 56 gives
a sum of 266
- 59. 60 x 9 is 540
and 4 x 9 is 36
and 540 + 36 gives
a sum of 576
- 61. 90 x 8 is 720
and 6 x 8 is 48
and 720 + 48 gives
a sum of 768
