3.3 Problem-Solving Investigation pages 147-148

Determine whether each problem requires an estimate or an exact answer. Then solve. (Click two.)

• Estimate

• Exact answer

• Yes; 32+49=81

  81>76

• Yes; 30+50=80

Determine whether each problem requires an estimate or an exact answer. Then solve. (Click two.)

• Estimate

• Exact answer

• 51 zeros; 21 zeros

• 50 zeros; 20 zeros

Determine whether each problem requires an estimate or an exact answer. Then solve. (Click two.)

• Estimate

• Exact answer

• Yes; 100+90=190; 190>180

• No; 95+92=187; 187>180

Determine whether each problem requires an estimate or an exact answer. Then solve. (Click two.)

• Estimate

• Exact answer

• $130-$100=$30

• $134-$102=$32

True or False: Pat found about 100 more pennies than Cynthia or Garcia

• True

• False

• about 500 books; 700-200=500

• 437 books; 650-213=437

• about $800; $1,700-$900=$800

• about $700; $1,700-$1,000=$700