Develop a quick way of mentally multiplying any number by 1001.
Can you write an ex
Use only the 1, 5 and 0 keys on a calculator to make given totals.
Estimate or calculate then put the large numbers in order of size.
Write the numbers written as words using digits.
A little lateral thinking will help you solve this number puzzle.
Without a calculator perform some calculations requiring a knowledge of place value.
Work out why subtracting a two digit number from its reverse gives a multiple of nine.
Arrange the digits one to nine to make a correct addition calculation.
Write out in words some numbers writen as digits (optional pirate theme)
How many ways can you write an expression for 100 which only uses the same digit repeated and any operations?
Arrange the numbers to produce the largest product.
Find a calculation for the current year which uses all of the digits 1 to 9.
Make sums from the three digit numbers given.
Can you work out what each of the strange symbols represents in these calculations?
Complete some imaginary cheques, the amount needs to be written in words.
Find calculations which written back to front give the same answer.
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Can you get to the target number by multiplying together four different one digit numbers? Can you do it in three different ways? There are nine levels to this online challenge and a virtual Transum Trophy available for each level.
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