Doubling

A Maths Starter of The Day

Write down the number 19

Without a calculator, double it and write down the answer

Double that and write down the answer

Double that and write down the answer

Double that and write down the answer

Double that and write down the answer

Double that and write down the answer

.... How far can you get before the register has been called?

 

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Keywords: Starter | Arithmetic

  • Mr Heeley's Y7 stars, NLC, Huddersfield
  • Monday, December 15, 2008
  • "It was no trouble to double!
    Well done Uhmera, who got to 44056 in less than 5 minutes!
    Merry Christmaths to everyone!
    Love Mr Heeley xxx"
  • Caitlin, N.i Belfast
  • Friday, December 10, 2010
  • "I got 9280 in less than 5 mins but I didnt do it in school I did it at home and my mum timed me !!! it was easy heeeheee!!!"

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This starter has scored a mean of 3.8 out of 5 based on 22 votes.

 

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Answers

19
38
76
152
304
608
1216
2432
4864
9728
19456
38912
77824
155648
311296
622592
1245184
2490368
4980736
9961472
19922944
39845888
79691776
159383552
318767104
637534208
1275068416
2550136832
5100273664
10200547328
20401094656
40802189312
81604378624
163208757248
326417514496
652835028992
1305670057984
2611340115968
5222680231936
10445360463872
20890720927744
41781441855488
83562883710976
167125767421952
334251534843904
668503069687808
1.33700613937562E+15
2.67401227875123E+15
5.34802455750246E+15
1.06960491150049E+16
2.13920982300099E+16