1. **State the problem:** Find which multiplication fact helps solve the division equation $27 \div 9 = 3$. 2. **Recall the relationship between multiplication and division:** Division is the inverse operation of multiplication. If $a \div b = c$, then $b \times c = a$. 3. **Apply the rule:** Given $27 \div 9 = 3$, the multiplication fact is $9 \times 3 = 27$. 4. **Check the options:** - A: $3 \times 27 = 81$ (not equal to 27) - B: $9 \times 3 = 27$ (correct) - C: $27 \div 4$ (not multiplication) - D: $9 \times 27 = 243$ (not equal to 27) **Answer:** Option B: $9 \times 3$. 2. **State the problem:** Find the multiplication number sentence that helps solve $\square \div 5 = 9$. 3. **Use the inverse operation:** If $x \div 5 = 9$, then $x = 9 \times 5$. 4. **Check options:** - A: $5 \times \square = 9$ (incorrect) - B: $9 \times \square = 5$ (incorrect) - C: $5 \times 9 = \square$ (correct) - D: $\square \times 5 = 9$ (incorrect) **Answer:** Option C: $5 \times 9 = \square$. 3. **State the problem:** Find which expression equals $3 \times 7$. 4. **Calculate $3 \times 7$:** $$3 \times 7 = 21$$ 5. **Evaluate each option:** - A: $(2 \times 7) + (1 \times 7) = 14 + 7 = 21$ (correct) - B: $(7 \times 5) - 2 = 35 - 2 = 33$ (incorrect) - C: $(3 \times 4) + (3 \times 5) = 12 + 15 = 27$ (incorrect) - D: $(3 \times 4) \times 3 = 12 \times 3 = 36$ (incorrect) **Answer:** Option A: $(2 \times 7) + (1 \times 7)$.