Max Conquers the Dragon's Gold: Multiply by 10 & 100

About this Grade 3 Multiplying By 10 100 Drill

Multiplying by 10 and 100 is a gateway skill that helps third graders understand how our decimal number system works and builds confidence with larger numbers. When students recognize that 7 × 10 = 70 and 7 × 100 = 700, they're learning a pattern, not memorizing random facts—this pattern thinking is essential for multiplication fluency and later division. At age 8-9, children are developing the abstract reasoning needed to see that multiplying by 10 simply means "moving" the digits one place left (or adding a zero), which transfers directly to real-world contexts like calculating money, measuring in centimeters, or understanding quantities at a store. Mastering this standard builds mental math speed, reduces reliance on counting, and prepares students for multi-digit multiplication and division coming in fourth grade. This skill also boosts number sense—students begin to see relationships between numbers rather than viewing each multiplication fact in isolation.

What your student will practice

• Multiply single-digit numbers by 10 with automaticity and accuracy
• Multiply single-digit numbers by 100 and explain the pattern using place value
• Apply multiplying-by-10-and-100 to solve word problems involving groups or arrays
• Recognize and extend patterns when multiplying by 10 and 100 consecutively

Common mistakes to watch for

The most common error is students writing 7 × 10 = 70 correctly but then treating 7 × 100 like 700 is two separate steps—they'll sometimes write 7 × 100 = 7000 because they add a zero twice or confuse the pattern. Another frequent mistake is reversing the operation: students might compute 70 ÷ 10 when they see 7 × 10, especially if they've recently practiced division. You'll spot this when a child writes 7 for the answer to 7 × 10. A parent or teacher can check by asking, "Is your answer bigger or smaller than 7?" to activate place-value thinking.