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Daily 30 Seconds - Easy

Click 'Start' to see the number you're starting with, and then follow the instructions until you get to the end.

 −2 ×4 +16 ÷4 +17 ÷7 SQUARE −9 HALVE ?

Daily 30 Seconds - Medium

 −10 ×6 +4 x 1/5 DOUBLE SQUARE −6 HALVE −13 ?

Daily 30 Seconds - Hard

 −2 x 31/3 ×2 x 60% x 2/3 −1 ÷7 +7 ?

Notes

• HALVE   divide by 2 (e.g. 10 ÷ 2 = 5)
• DOUBLE  multiply by 2 (e.g. 10 x 2 = 20)
• SQUARE  times by itself (e.g. 10 x 10 = 100)
• CUBE    times by itself twice (e.g. 10 x 10 x 10 = 1,000)
• x 3/5   find three fifths (e.g. 1/5 of 15 = 3, so 3/5 = 9)
• x 21/3  find two and a third (e.g. 2 1/3 of 15 = 2 x 15 + 5 = 35)
• x 10%   find 10% (e.g. 10% of 80 = 8)
• √       find the square root (e.g. the square root of 100 is 10)