To solve $20 \times 34$ using a place value chart, the problem is rewritten as $2 \times (10 \times 34)$. What is the first step in visualizing this calculation?

Multiply 34 by 10 by shifting its digits one place to the left.

Multiply two-digit multiples of 10 by two-digit numbers using a place value chart. Practice — Grade 4 math

Lesson 1: Multiply two-digit multiples of 10 by two-digit numbers using a place value chart. — Practice Questions

1. Which expression shows how to correctly regroup the factors in $50 \times 18$ using the associative property?
- A. $5 \times (10 \times 18)$
- B. $(5 \times 18) \times 10$
- C. $(5 + 10) \times 18$
- D. $50 \times (10 + 8)$
2. Use the associative property to fill in the blank. $60 \times 13 = (6 \times 10) \times 13 = 6 \times (10 \times$ ___$)$
3. To solve $20 \times 34$ using a place value chart, the problem is rewritten as $2 \times (10 \times 34)$. What is the first step in visualizing this calculation?
- A. Multiply 34 by 10 by shifting its digits one place to the left.
- B. Multiply 34 by 2.
- C. Create 20 groups of 34.
- D. Add 10 to 34.
4. Complete the equation that demonstrates the associative property of multiplication. $(7 \times 10) \times 25 = 7 \times ($___$ \times 25)$
5. Which property of multiplication allows you to rewrite $30 \times 41$ as $3 \times (10 \times 41)$?
- A. Associative Property
- B. Commutative Property
- C. Distributive Property
- D. Identity Property
6. When multiplying $(8 \text{ tens}) \times (4 \text{ tens})$, what is the resulting place value unit for the product?
- A. ones
- B. tens
- C. hundreds
- D. thousands
7. Use the unit form method to find the product of $70 \times 20$. The product is ___.
8. Calculate the product of $90 \times 6$ using unit form. The result is ___.
9. Which expression correctly shows how to find the product of $40 \times 80$ using unit form?
- A. (4 tens) × (8 ones)
- B. (4 × 8) tens
- C. (4 × 8) hundreds
- D. (4 ones) × (8 ones)
10. Find the product of $80 \times 50$. The answer is ___.