Chapter 1
Page 46
Do You Know How?
Do You Understand?
Adding and Subtracting Whole Numbers (1-11)
Add or subtract.
Explain the steps you followed to
regroup in Exercise 3.
1.
2.
Explain how you can check that each
answer is reasonable.
3.
416,099 + 37,983
4.
700,803 – 59,004
Adding Decimals (1-12)
Add.
Tell how you found each sum.
5.
6.
Explain why it is important to line up the
decimal points when you are adding.
7.
0.63 + 4.927
8.
46.9 + 3.61
Subtracting Decimals (1-13)
Subtract.
Tell how you found each difference.
9.
10.
Explain why it is important to
write zeros to show place value in
Exercise 12.
11.
47.86 – 13.678
12.
0.2 – 0.173
Problem-Solving Skill: Look Back and Check (1-14, 1-15)
Ages
Mitch is 14 years old. His sister is
6 years older than his brother. Mitch’s
brother is 2 years younger than Mitch.
How old is Mitch’s sister?
Tell how you know Keith’s answer is
reasonable.
Explain how to check Keith’s work.
Does his work match the information
in the problem? Did he use correct
operations and procedures?
13
.
Did Keith answer the right question?
Products found by breaking one of the factors into ones, tens, hundreds, and so on, and then multiplying each of these by the other factor.