Curriculum›4A›Chapter 4

Practice B: Multiplication

Chapter 4 · Consolidation 2

Mixed consolidation. Attempt problems independently before revealing the solutions.

Question 1 · calculation

Calculate 22 × 7 using a split or friendly number.

Show answer & reasoning
154

Split 22 into 20 + 2. Then multiply each part by 7 and add the partial products.

Question 2 · calculation

Calculate 70 × 2.

Show answer & reasoning
140

70 × 2 = (70 × 2) + (0 × 2) = 140. Each partial product uses its correct place value.

Question 3 · calculation

Calculate 150 × 4.

Show answer & reasoning
600

150 × 4 = (150 × 4) + (0 × 4) = 600. Each partial product uses its correct place value.

Question 4 · calculation

Calculate 131 × 80.

Show answer & reasoning
10,480

80 represents 8 tens. Multiply by 8, then scale by 10 to obtain 10,480.

Question 5 · area model

Find 53 × 45 using an area model or partial products.

Show answer & reasoning
2,385

Expand (50+3)(40+5) = 2000+250+120+15 = 2385.

Question 6 · area model

Find 356 × 41 using an area model or partial products.

Show answer & reasoning
14,596

Expand (350+6)(40+1) = 14000+350+240+6 = 14596.

Question 7 · calculation

Calculate 26 × 7 using a split or friendly number.

Show answer & reasoning
182

Split 26 into 20 + 6. Then multiply each part by 7 and add the partial products.

Question 8 · calculation

Calculate 48 × 5.

Show answer & reasoning
240

48 × 5 = (40 × 5) + (8 × 5) = 240. Each partial product uses its correct place value.

Question 9 · calculation

Calculate 110 × 4.

Show answer & reasoning
440

110 × 4 = (110 × 4) + (0 × 4) = 440. Each partial product uses its correct place value.

Question 10 · calculation

Calculate 54 × 60.

Show answer & reasoning
3,240

60 represents 6 tens. Multiply by 6, then scale by 10 to obtain 3,240.

Question 11 · area model

Find 56 × 35 using an area model or partial products.

Show answer & reasoning
1,960

Expand (50+6)(30+5) = 1500+250+180+30 = 1960.

Question 12 · area model

Find 58 × 41 using an area model or partial products.

Show answer & reasoning
2,378

Expand (50+8)(40+1) = 2000+50+320+8 = 2378.

Question 13 · calculation

Calculate 27 × 4 using a split or friendly number.

Show answer & reasoning
108

Split 27 into 20 + 7. Then multiply each part by 4 and add the partial products.

Question 14 · calculation

Calculate 88 × 2.

Show answer & reasoning
176

88 × 2 = (80 × 2) + (8 × 2) = 176. Each partial product uses its correct place value.

Question 15 · calculation

Calculate 125 × 2.

Show answer & reasoning
250

125 × 2 = (120 × 2) + (5 × 2) = 250. Each partial product uses its correct place value.

Question 16 · calculation

Calculate 64 × 90.

Show answer & reasoning
5,760

90 represents 9 tens. Multiply by 9, then scale by 10 to obtain 5,760.

Question 17 · area model

Find 51 × 20 using an area model or partial products.

Show answer & reasoning
1,020

Expand (50+1)(20+0) = 1000+0+20+0 = 1020.

Question 18 · area model

Find 33 × 13 using an area model or partial products.

Show answer & reasoning
429

Expand (30+3)(10+3) = 300+90+30+9 = 429.