Back in the early 1900s, before calculators lived in our pockets, crunching numbers was painstaking work. Adding machines existed, but they weren’t exactly convenient nor cheap. Enter Wilken Wilkenson ...

More work with fractions but using time, and some additional work on multiplication. This lessons has some more work with fractions but using time, and some additional work on multiplication.

· 3.4 K – Solve one and two-step problems involving multiplication and division · 4.4 H - Solve with fluency one- and two-step problems involving multiplication and division, including interpreting ...

Numberphile revived an ancient multiplication trick—halves and doubles—also called Egyptian or Russian math, where you repeatedly halve one number and double the other. After crossing out rows with ...

Do you stare at a math word problem and feel completely stuck? You're not alone. These problems mix reading comprehension ...