3A · Chapter 5 · Practice
Practice A
Attempt independently, then review the full reasoning in the answer key.
Attempt independently, then review the full reasoning in the answer key. No name, account, or answer is transmitted to any server.
Assessment · 12 questions
Problems
The complete solutions are available here after each question and on the printable answer-key page.
- A1
Find 7 × 200; explain the units of the product.
Show answer and reasoning
Answer: 1400
200 is 2 groups of 100; 7×2=14 groups of 100 equals 1,400.
- A2
Find 8 × 50; explain the units of the product.
Show answer and reasoning
Answer: 400
50 is 5 groups of 10; 8×5=40 groups of 10 equals 400.
- A3
Find 2 × 800; explain the units of the product.
Show answer and reasoning
Answer: 1600
800 is 8 groups of 100; 2×8=16 groups of 100 equals 1,600.
- A4
Calculate 322 × 2 using partial products.
Show answer and reasoning
Answer: 644
Split 322 by place value; multiply each part by 2 and add. Total is 644.
- A5
Calculate 322 × 3 using partial products.
Show answer and reasoning
Answer: 966
Split 322 by place value; multiply each part by 3 and add. Total is 966.
- A6
Calculate 332 × 2 using partial products.
Show answer and reasoning
Answer: 664
Split 332 by place value; multiply each part by 2 and add. Total is 664.
- A7
Calculate 53 × 2 and show the exchanges.
Show answer and reasoning
Answer: 106
53×2 = 0 + 100 + 6 = 106; combine partial products and exchange groups of ten.
- A8
Calculate 63 × 2 and show the exchanges.
Show answer and reasoning
Answer: 126
63×2 = 0 + 120 + 6 = 126; combine partial products and exchange groups of ten.
- A9
Calculate 73 × 2 and show the exchanges.
Show answer and reasoning
Answer: 146
73×2 = 0 + 140 + 6 = 146; combine partial products and exchange groups of ten.
- A10
Calculate 15 × 2 and show the exchanges.
Show answer and reasoning
Answer: 30
15×2 = 0 + 20 + 10 = 30; combine partial products and exchange groups of ten.
- A11
Calculate 25 × 2 and show the exchanges.
Show answer and reasoning
Answer: 50
25×2 = 0 + 40 + 10 = 50; combine partial products and exchange groups of ten.
- A12
Calculate 35 × 2 and show the exchanges.
Show answer and reasoning
Answer: 70
35×2 = 0 + 60 + 10 = 70; combine partial products and exchange groups of ten.