Two-digit by two-digit multiplication takes center stage. Students finish partial-product chains like 68 x 24 = 272 + 1,360, fill in the missing rectangle (5 x 6 = 30) in the 35 x 16 area model, and compute 42 x 37, 57 x 46, and 66 x 28. A garden problem with 23 rows of 41 plants and an estimation question (80 x 30 for 77 x 34) round out Part A, and matching links 39 x 17, 54 x 26, 72 x 13, and 85 x 11 to their products.
Seeing the same problem written four different ways helps the algorithm finally click.
Style:
Multi-Digit Multiplication
Part A: Fill in the Blank
Write the missing word or number on each line.
1. Using partial products, 68 × 24 = 68 × 4 + 68 × 20 = 272 + 1,360 = 1,632
2. In the area model for 35 × 16, the four rectangles are 30 × 10 = 300, 30 × 6 = 180, 5 × 10 = 50, and 5 × 6 = 30
3. 42 × 37 = 1,554
4. The first partial product of 84 × 19 is 84 × 9 = 756
5. The second partial product of 84 × 19 is 84 × 10 = 840
6. 57 × 46 = 2,622
7. A garden has 23 rows with 41 plants in each row. The garden has 943 plants.
8. Estimate 77 × 34 by rounding: 80 × 30 = 2,400
9. 66 × 28 = 1,848
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
39 × 17
→ 663
936
54 × 26
→ 1,404
935
72 × 13
→ 936
1,404
85 × 11
→ 935
663
Multi-Digit Multiplication
★ Part A: Fill in the Blank
Write the missing word or number on each line.
1) Using partial products, 68 × 24 = 68 × 4 + 68 × 20 = 272 + 1,360 = 1,632
2) In the area model for 35 × 16, the four rectangles are 30 × 10 = 300, 30 × 6 = 180, 5 × 10 = 50, and 5 × 6 = 30
3) 42 × 37 = 1,554
4) The first partial product of 84 × 19 is 84 × 9 = 756
5) The second partial product of 84 × 19 is 84 × 10 = 840
6) 57 × 46 = 2,622
7) A garden has 23 rows with 41 plants in each row. The garden has 943 plants.
8) Estimate 77 × 34 by rounding: 80 × 30 = 2,400
9) 66 × 28 = 1,848
★ Part B: Matching
Match each item on the left to the correct answer on the right.
1) Match each item to its correct answer.
39 × 17
→ 663
936
54 × 26
→ 1,404
935
72 × 13
→ 936
1,404
85 × 11
→ 935
663
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