Multiply by 10

key notes :

What does it mean?

Multiplying a number by 10 means adding one zero to the end of the number.

Example:

• 4 × 10 = 40 ✅
• 7 × 10 = 70 ✅

Using place value

When we multiply by 10, each digit moves one place to the left.

Example:

• 23 × 10 → 2 moves to hundreds, 3 moves to tens → 230 ✅

Multiplying with single-digit numbers

Easy to remember: just add a zero at the end.

Example:

• 8 × 10 = 80
• 5 × 10 = 50

Multiplying with two-digit numbers

Write the number first, then add a zero.

Example:

• 12 × 10 = 120
• 35 × 10 = 350

Tip / Trick:

• Think: “10 times bigger” → so number grows ten times.
• Example: 6 × 10 = 60 → 6 is now ten times bigger.

Visual Example:

Using objects:

• 3 boxes × 10 apples = 30 apples 🍎🍎🍎… (10 apples in each box)

Common Mistake to Avoid:

• Don’t just add 1; you must add a zero or shift digits.
• Wrong: 4 × 10 = 14 ❌
• Correct: 4 × 10 = 40 ✅

Learn with an example

let’s practice!