They are from Chapter 7 in Volume 2, Three Skills For Algebra . Hint have someone look at your written work when you answer problems, here or elsewhere. Improper writing or notation in mathematics and in work written for other subject is a sign of miscomprehension. A person who cannot read precisely what is written will not catch his or her errors when writing. Arithmetic is the first subject in mathematics in which an error in one step makes all the following suspect.
Logic is the second.
2.1 Basic Stuff Answers are given in appendix F, part I Perform the indicated calculations by hand. Then check your calculations with the aid of a calculator. Find the sum of the three numbers 456 and 76 and 312. Find the product of 176 and 86. Subtract 2396 from 4892 and check your answer.