77.6 is about twice the value of 38. So d8 must go into 776 2 times, 20 times, 200 times, etc. Changing that 77.6 number back to 776 must add one decimal place to 2 times, and it becomes 20 times.
The actual times is about 20.42, so the estimate was pretty close.
53
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.
A factor = a number which can be divided into the given number with no remainder| Known factors of 38: 1, 2, 19, 38| Prime numbers: numbers that can only be multiplied one time/ numbers with only one set of numbers/ numbers that can only be divided one time.
19 ! It goes twice into 38, and three times into 57.
40 x 30 = 1200
20.4211
20.4211
0.049
38
53
51 divided 38 = 1.3421052631578947
1.9
2
0.1053
0.0045
0.0096
217