Estimating the product of 68 and 21 . . .
It is easy in your head to think that this product would be close to 70 times 20. Again, in your head, you can figure that product to be 1400.
89 - 21 = 68
2 x 2 x 17 = 68
Round 38 to 40. Estimate the product as 80. The actual product is 76.
90 x 70 = 6300
21 as a product of its prime factors is 1 X 3 X 7.
1428
68
Estimate: 40 times 70 = 2800 Actual: 2924
68-21 = 47
150 x 20 = 3000
68 multiplied by 21 is 1,428
The product is 68
$68
68
68 multiplied by 90 is 6,120.
68 x 52 = 3,536
34 multiplied by 68 is 2,312.