45×5

Answer: 225

Step-by-step explanation (in English, as the chosen subject is English, but still clear math reasoning):

1. Understand the expression

• 45 × 5 means 45 multiplied by 5 (the product of the two numbers).

2. Method 1: Distributive property (use that 45 = 40 + 5)

• 45 × 5 = (40 + 5) × 5
• Apply distributive property: (40 × 5) + (5 × 5)
• Compute: 40 × 5 = 200 and 5 × 5 = 25
• Sum: 200 + 25 = 225

3. Method 2: Mental math (split 45 into 40 and 5)

• 5 × 45 = (5 × 40) + (5 × 5)
• 5 × 40 = 200, 5 × 5 = 25
• 200 + 25 = 225

4. Method 3: Quick check by halving one factor after doubling to 10

• 45 × 5 = (45 × 10) ÷ 2 = 450 ÷ 2 = 225

5. Final check

• All straightforward methods give the same result: 225.

Key terms (for English language learners):

• Product: the result of multiplication
• Factor/Multiplier: the numbers being multiplied
• Distributive property: a × (b + c) = (a × b) + (a × c)
• Mental math: solving in your head without a calculator
• Long multiplication: the standard column method (not needed here since the multiplier is a single digit)

If you’d like, I can translate these steps into Russian and point out the English math vocabulary line by line.