Doubling

A Maths Starter of The Day

Write down the number 5

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

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This starter has scored a mean of 3.9 out of 5 based on 11 votes.
 

  

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Answers

5
10
20
40
80
160
320
640
1280
2560
5120
10240
20480
40960
81920
163840
327680
655360
1310720
2621440
5242880
10485760
20971520
41943040
83886080
167772160
335544320
671088640
1342177280
2684354560
5368709120
10737418240
21474836480
42949672960
85899345920
171798691840
343597383680
687194767360
1374389534720
2748779069440
5497558138880
10995116277760
21990232555520
43980465111040
87960930222080
175921860444160
351843720888320
703687441776640
1.40737488355328E+15
2.81474976710656E+15
5.62949953421312E+15