Multi-Digit Multiplication — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. 73 × 18 = 1,314
73×8=584; 73×10=730; 584+730=1,314.
2. Estimate 67 × 42 by rounding: 70 × 40 = 2,800
70×40=2,800. (Actual: 67×42=2,814.)
3. 91 × 24 = 2,184
91×4=364; 91×20=1,820; 364+1,820=2,184.
4. 38 × 52 = 1,976
38×2=76; 38×50=1,900; 76+1,900=1,976.
5. Estimate 85 × 19 by rounding: 90 × 20 = 1,800
90×20=1,800. (Actual: 85×19=1,615.)
6. 44 × 33 = 1,452
44×3=132; 44×30=1,320; 132+1,320=1,452.
7. 76 × 14 = 1,064
76×4=304; 76×10=760; 304+760=1,064.
8. A baker makes 28 muffins each day for 15 days. The baker makes 420 muffins.
28×15: 28×5=140; 28×10=280; 140+280=420.
9. 59 × 47 = 2,773
59×7=413; 59×40=2,360; 413+2,360=2,773.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
25 × 36
→ 900
913
48 × 22
→ 1,056
1,056
83 × 11
→ 913
2,790
62 × 45
→ 2,790
900
25×36=900; 48×22=1,056; 83×11=913; 62×45=2,790.