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Grade 3 Math · Level 6, Grade 4 Preview

Factors & Multiples — Intro

How the lesson starts: Factors & Multiples — Intro

1. Nia's cupcake party

   Hi friend! Nia is planning a party. She has 12 cupcakes. She wants them in neat rows, with the same number in every row. Which row sizes work? Let's help!

2. 3 rows of 4

   Nia tries 3 rows of 4. It fits perfectly, with none left over! 3 × 4 = 12. So 3 and 4 are factors of 12. A factor fits into a number exactly.

3. Rows of 5? Nope!

   What about rows of 5? Here's row 1 with 5. Row 2 with 5. Then only 2 cupcakes are left. That row isn't full! So 5 is not a factor of 12. Leftovers mean it's not a factor.