Level 1
What is the length of the arrow as shown in the figure?
1 m
Level 2
9 lamp posts are planted along a road at equal distances.
The distance between the 2nd and the 4th lamp post is 17.9 m.
What is the distance between the 1st and the last lamp post?
4 m
Level 1
Find the following values without a calculator.
  1. 57, 58, ___
  2. 64, ___, 84
  3. 508, 608, ___
1 m
Level 1
Find the following values without a calculator.
  1. 59, 58, ___
  2. 84, ___, 64
  3. 508, 408, ___
1 m
Level 3
Adam has 30 stickers.
He increases the number of stickers by 10 every day.
How many days will it take to have 70 stickers?
4 m