1ºESO UNIDAD 1: NÚMEROS NAURALES

Some differences between the Decimal (number) system and the Roman (number) system are:

• The decimal sistem uses digits (1,2,3...) and the roman system uses leters (I,V,X...)

• The roman system IS an additive

  system (if you change the order of the symbols,

  the number changes)

• You CANT NOT write the number cero in the Roman system

Wich number system is additive?

• Decimal number system

• Roman number system

• Egyptian number system

Two thousands is...

• 2.000

• 200

• 2.000.000

one billion is...

• one million millions

• one thousand thousands

• two millions

two million, three houndred and fifty thousand is...

• 2.350.000

• 2.050.300

• 2.350

Which number is CLOSER to 138.290?

• 100.000

• 138.000

• 138.300

• 140.000

253.000 is the ROUND TO THOUSANDS of...

• 253.289

• 253.928

ROUND 16.254.007 to TENS OF THOUSANDS

• 16.250.000

• 16.254.000

• 16.260.000

Whats the difference between 7.496 and 1.280?

• 6.216

• 8.776

• 5

You buy five T-shirts and two pair os trousers. If each T-shirt cost 12€ and each pair of trusers 23€, How much money did you pay for them?

• $5\cdot12+2\cdot23\ \$

• $5\cdot12+2\cdot2\cdot23\ \$

• $2\cdot12+5\cdot23\$

• $5+2+12+23\$