B34 — Multiplication within 100: Automatizing the Basic Facts Using the Array
Problem Strings for Fluency and Beyond · Multiplication within 100: Automatizing the Basic Facts Using the Array
Teacher notes
This string is like B30, but it extends doubling and halving to quartering and quadrupling and thirding and tripling. Now there is an opportunity to focus on how factors are moving around: 6 x (2 x 4) = (6 x 2) x 4 and (8 x 3) x 2 = 8 x (3 x 2).
See B30 — Multiplication within 100: Automatizing the Basic Facts Using the Array for the full "Behind the Numbers" explanation — this string uses the same crafting logic.
The string
- 6x8
- 12 x 4
- 3 x 16
- 24 x 2
- 8x6
- 4 x 12
