537 round to 530
78 round to 80
53*2 = 106
106*2 = 212
121*2 = 424
and the two 0s - one each from 530 and 80 - make it 42400.
[The exact answer is 41886]
80 x 8000 = 640000
78 and 10
A reasonable estimate of the sum of 78 and 119 is 197.
6786
45-78*j
537 multiplied by 78 is 41,886.
The number 4 is a product of 2 x 2, for example.
it is 80,000.
1200 x 80 = 96000
80 x 8000 = 640000
78 as a product of its prime factors is: 2 x 3 x 13 = 78
45 * 78 = 3510
The product of 78 and 7 is 546
78 and 10
As 5 is immediately after the decimal point we round up, so the answer is 78.
A reasonable estimate of the sum of 78 and 119 is 197.
1,162 multiplied by 78 is 90,636.