Adding and Subtracting Decimal Placement

Estimate the difference of 17.45 and 15.33

• 2

• 3

• 1

• 4

Which shows the correct decimal placement for 4.9 x 7?

• 3,430

• 343

• 34.3

• 3.43

Which shows the correct decimal placement for 7 x 12.1?

• 847

• 84.7

• 8.47

• 0.847

What is the best estimate for this number?

• 2

• 24

• 40

• 10

Find the sum of 64.07 + 12.203

• 76.273

• 186.10

• .76273

Find the difference of 90.139 - 45.93

• 45.209

• 55.791

• 136.069

• 44.209

Solve the following: 67.9 + (-22.738)

• 45.172

• 45.162

• 21.941

• 6

Solve the following: (-14.509) - (-67.02)

• 11

• 81.529

• -81.529

• 52.511

What is the first step in adding and subtracting decimals?

• Align the numbers

• Align the decimals

• Add or subtract as usual

• Add placeholders

123.07 + 74.9 = _____

• 197.97

• 872.07

• 130.56

• None of the above