How it works
This 40 multiplication chart holds every fact from 1 × 1 to 40 × 40 = 1,600. The 40 row and column are tinted, and that row is the 4 row with a 0 written after each answer.
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What is on a multiplication chart 1 to 40
A multiplication chart 40x40 has 1,600 squares but only 517 different answers. Count each fact and its turnaround once and the chart has 820 facts, against 78 on a 12 by 12 chart. Just 24 answers appear once, and every one is a square number.
Real numbers in the 40 row
40 × 9 = 360 is the degrees in a full turn and 40 × 36 = 1440 the minutes in a day. 40 × 11 = 440 is the yards in a quarter mile, 40 × 16 = 640 the acres in a square mile, and 40 × 40 = 1600 the meters in 4 laps of a 400 meter track.
- The tinted row comes from the 4 row. 4 × 17 = 68, so 40 × 17 = 680, and 4 × 23 = 92, so 40 × 23 = 920.
- A US roll of quarters holds 40 coins, so 40 × 25 = 1000 cents, or 10 dollars. Forty nickels make 40 × 5 = 200 cents.
Questions and answers
Is a 40 by 40 multiplication chart the same as a 1-40 multiplication chart?
Yes. Each name describes rows and columns numbered 1 to 40, and a multiplication chart to 40 ends with 40 × 40 = 1,600 in the last square. Typed without the dash, a multiplication chart 1 40 is the same grid.
Why does 120 fill more squares than any other answer on a 40x40 multiplication chart?
120 has six factor pairs that fit: 3 × 40, 4 × 30, 5 × 24, 6 × 20, 8 × 15 and 10 × 12. Each pair fills 2 squares, so 12 light up. This multiplication chart up to 40 gives 240 and 360, among others, only 10 squares each.
How much of a 40 x 40 multiplication chart can I fill in on screen?
400 squares, a quarter of it. Under Show the numbers, Partly blank hides 400 at every percent setting. Blank takes answers in the first 20 rows and columns. Check marks each box right or wrong. For the other 1,200 squares, print the blank chart.