Third graders learn a multiplication superpower — to multiply by 10, 20, 30, and beyond, they just multiply the basic fact and add a zero, so 3 × 40 becomes 12 with a zero: 120.
Students will be able to…
You know 3 × 4 = 12. So what is 3 × 40? There’s a quick trick using the fact you already know!
Project each item and have students solve. The tool shows the basic fact plus a zero — the multiple-of-10 trick.
Tap any phase to open the teacher moves and student actions.
You know 3 × 4 = 12 — so what is 3 × 40?
Teacher models.
Class uses Times a Multiple of 10.
Students multiply.
One product.
Aligned to the Common Core State Standards for Mathematics.
Multiply one-digit whole numbers by multiples of 10.
Fluently multiply within 100.
Use place-value understanding to compute.
Use place-value structure to multiply.
Preview the three formative checks. Tap “Sample answer” to see what mastery looks like — hide them before you print for students.
Have students extend the trick to multiples of 100 — like 3 × 400 = 1,200 (3 × 4 = 12, then add two zeros). A printable multiplication sheet is in the Math library.
Tap a card to flip it, then rate whether you knew it. Built from this lesson’s vocabulary.
A quick self-check with instant feedback, drawn from this lesson’s key terms.
A print-and-go review sheet with a built-in answer key. Tap “Show answer key” to reveal answers, or print the clean version for students.