Arthur Benjamin Left to Right Math Sprint
Build mental calculation speed using the Arthur Benjamin mental math routine, calculating left to right rather than right to left.
4 time blocks, 17 minutes in total.
Time blocks
- Left to Right Mindset Anchor: 3 min
Review the left to right rule for hundreds and tens place products - Two Digit Left to Right Expansion: 5 min
Multiply tens first then units, verbalizing intermediate sums - Subtotal Accumulation Drill: 5 min
Solve 10 timed multiplication problems keeping sub totals in mind - Squaring Short Cut Practice: 4 min
Square two digit numbers using rounding distance products
About this routine
Standard school mathematics teaches calculation from right to left, starting with units and carrying digits across columns. Mathematician Arthur Benjamin advocates reversing this approach completely. The Arthur Benjamin mental math routine turns multiplication into a structured sequence of left to right addition.
By calculating the tens or hundreds first, you immediately grasp the magnitude of the final product. Intermediate sub totals are held aloud or in short term memory, eliminating the need for scrap paper. Short, focused practice blocks reinforce these mental steps until the expanded addition becomes second nature.
Why this routine works
- Calculates products faster without needing paper
- Strengthens short term memory by holding sub totals
- Improves numerical estimation and number sense
FAQ
What is the Arthur Benjamin mental math routine?
It is a mental calculation practice system where you multiply numbers from left to right, breaking complex problems into simple addition steps.
Why multiply left to right instead of right to left?
Calculating left to right yields the most significant digits first, making estimation instant and matching how numbers are naturally spoken.
How long does left to right mental math practice take?
This structured session takes 17 minutes, covering mindset setup, expansion drills, timed subtotals, and squaring shortcuts.