Hi! I'm Vidi. Let's learn Multi-Digit Multiplication together — read with me, then play the games to win a ⭐!
🔵Multiplying 2-Digit & 3-Digit Numbers
To multiply by a 2-digit number, multiply by the ones, then by the tens (remember the tens give a number ending in 0), and add the two partial products.
Example: 23 × 12 → 23 × 2 = 46, and 23 × 10 = 230; 46 + 230 = 276.
👀 See a worked example
Multiply 123 × 4.
4 × 123 = 492.
Multiply 45 × 20.
45 × 2 = 90, then add a zero → 900.
🤖 Vidi's Key Points
- Multiply by the ones, then the tens, and add the partial products.
- Multiplying by tens gives a number ending in 0.
- 23 × 12 = 46 + 230 = 276.
🟢Estimating & Word Problems
Estimate a product by rounding each number first — useful to check your answer is sensible. In word problems, 'each', 'per', 'rows of' and 'times' mean multiply.
👀 See a worked example
A box has 24 pens. How many in 15 boxes?
24 × 15 = 360 pens.
Estimate 48 × 21.
≈ 50 × 20 = 1000 (exact 1008).
🤖 Vidi's Key Points
- Estimate products by rounding first.
- 'Each / per / rows of / times' mean multiply.
- Use the estimate to check your exact answer.
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