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
90 x 70 = 6300
21 as a product of its prime factors is 1 X 3 X 7.
To round to estimate the product of 38 x 2, you first round each number to a more manageable value. In this case, you can round 38 to 40 and 2 to 0. Then, multiply the rounded numbers together to get an estimate of the product. In this case, 40 x 0 = 0. So, the estimated product of 38 x 2 is 0.
1428
68
68-21 = 47
150 x 20 = 3000
68 multiplied by 21 is 1,428
The product is 68
$68
34 multiplied by 68 is 2,312.
68 x 52 = 3,536
To find 21 percent of a number, multiply the number by 0.21. In this instance, 0.21 x 68 = 14.28. Therefore, 21 percent of 68 is equal to 14.28.
68 x 16 = 1088
68 multiplied by 37 is 2,516.