Halve It

A Maths Starter of The Day

Start with 100.

Halve it to get 50

Halve it to get 25

Continue as far as possible.

No Calculators

[Decimal fractions are allowed]

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Keywords: Starter | Arithmetic

  • Transum,
  • Wednesday, February 01, 2012
  • "A challenge for the more able who volunteer... two students stand at the front of the class with their back to the screen (which is showing the answers below and which the rest of the class can see). The first volunteer says 100. The second halves that and says the answer. The first halves the second's number and so on. The winner is the one who can last the longest without making a mistake."

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This starter has scored a mean of 3.5 out of 5 based on 35 votes.

 

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Answers

100
50
25
12.5
6.25
3.125
1.5625
0.78125
0.390625
0.1953125
0.09765625
0.048828125
0.0244140625
0.01220703125
0.006103515625
0.0030517578125
0.00152587890625
0.000762939453125
3.814697265625E-04
1.9073486328125E-04
9.5367431640625E-05
4.76837158203125E-05
2.38418579101563E-05
1.19209289550781E-05
5.96046447753906E-06
2.98023223876953E-06
1.49011611938477E-06
7.45058059692383E-07
3.72529029846191E-07
1.86264514923096E-07
9.31322574615479E-08
4.65661287307739E-08
2.3283064365387E-08
1.16415321826935E-08
5.82076609134674E-09
2.91038304567337E-09
1.45519152283669E-09
7.27595761418343E-10
3.63797880709171E-10
1.81898940354586E-10
9.09494701772928E-11
4.54747350886464E-11
2.27373675443232E-11
1.13686837721616E-11
5.6843418860808E-12
2.8421709430404E-12
1.4210854715202E-12
7.105427357601E-13
3.5527136788005E-13
1.77635683940025E-13
8.88178419700125E-14

 

 
Computer Teacher, do your students have access to computers?
Do you have "Laptops in Lessons"?

Whether your students each have a TabletPC or share a desktop PC, this activity lends itself to eLearning (Engaged Learning).

Laptop

Here is the URL which will take them to a concise version of this page.

Transum.org/go/?Start=July9

Here is the URL which will take them to a division quiz.

Transum.org/go/?to=Division