Chapter 1
Page 34
Do You Know How?
Do You Understand?
Adding and Subtracting Mentally (1-7)
Use mental math to add or subtract.
Tell how you used mental math to
find the answer for Exercise 1.
1.
1,940 + 3,160
2.
110 + 40 + 90
3.
372 – 197
4.
2,360 – 2,290
Explain how you could use equal
additions to find the answer in
Exercise 3.
Rounding Whole Numbers and Decimals (1-8)
Round each number to the place of the underlined digit.
Tell how you rounded each number.
Explain why 47.615 is closer to
48 than 47.
5.
4
7
3,281,553
6.
98
1
,387
7.
23.1
0
5
8.
46.
8
46
Estimating Sums and Differences (1-9)
Estimate the sum or difference.
Explain how you found your estimate
for Exercise 9.
9.
769 + 372
10.
8,436 – 2,609
11.
14.81 – 11.14
12.
3.9 + 4.4
Tell if your answer for Exercise 9 is
an overestimate or an underestimate.
Explain.
Problem-Solving Skill—Plan and Solve (1-10)
Quilt Blocks
Rhonda made a square quilt for her daughter that had 8 rows and 8 columns. She wants to make a larger one for herself. What is the least number of blocks she could add and still have a square?
Tell how you decided which strategy
Rhonda used to solve the Quilt Blocks
problem.
Give the answer to the Quilt Blocks
problem in a complete sentence.
13.
Name the strategy Rhonda used to
solve the Quilt Block problem.
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.