How it works
Start at 1, double it 5 times and you reach 32. Double 5 more times and you reach 1,024, the bottom right corner of this 32 multiplication chart. New practice chart hides 400 of the answers. Type them in and press Check.
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Old answers and new ones in the 32 row
A multiplication chart 32 rows deep has 1,024 squares holding 354 different answers. The tinted row brings only 15 new ones. Its first 15 answers are in the 16 row already, because 32 × 7 and 16 × 14 are the same 224. So are 576 and 672. 512 is the first new answer, and everything from 704 on is new.
Size 33: a multiplication chart 1-33
Under the chart, pick 1 to 33 under Chart size for a 33rd row and column: 1,089 squares, 372 answers. 33 × 3 = 99, so every third fact in that row is a round number minus a small one. 33 × 6 = 200 − 2 = 198, and 33 × 21 = 700 − 7 = 693.
- Five doublings multiply any number by 32. Try 7: 14, 28, 56, 112, 224. Tap any 224 to light every 224.
- Move a hard fact somewhere easier by halving 32 and doubling its partner. 32 × 15 becomes 16 × 30, and both squares hold 480.
Questions and answers
What are the multiples of 32 up to 1,024?
32, 64, 96, 128, 160, 192, 224, 256, 288, 320, then 352, 384, 416, 448, 480, 512, 544, 576, 608, 640, then 672, 704, 736, 768, 800, 832, 864, 896, 928, 960, 992 and 1,024. The last digits repeat 2, 4, 6, 8, 0.
Why is 1,024 the only four-digit number on the chart?
The next largest answer is 31 × 32 = 992, so only 32 × 32 gets past 999. Set Chart size to 1 to 33 and there are four: 1,023, 1,024, 1,056 and 1,089, in 6 squares in the bottom right corner.
Where are the powers of 2 on the chart?
Keep doubling from 1 and you get 2, 4, 8, 16, 32, 64, 128, 256, 512 and 1,024. All 11 numbers are on this chart, in 36 squares between them. 32 sits in 6 squares and 1,024 in just 1, the corner.
What is the number trick that ends on 1,089?
Pick a three-digit number whose first and last digits are at least 2 apart, say 732. Reverse it and subtract: 732 − 237 = 495. Add that to its own reverse: 495 + 594 = 1,089, which is 33 × 33, the corner of the size 33 chart.