# What is a two-digit natural number

## This is math 1, textbook

A3 Order of the natural numbers 23 If you add its predecessor to a number, you get a) 7, b) 39 c) 473. What is the name of the number? Give reasons for your answer! When adding a number and its successor (or predecessor), you always get an odd number. Explain why this is always the case! Search for specific numbers Enter all those numbers from 1 to 100 that have the digit a) 4, b) 7 in the ones place! Write down all natural numbers, a) that are greater than 21 and less than 37, b) that are greater than 998 and less than 1 007! Write down all even numbers between a) 58 and 72, b) 95 and 111, c) 315 and 359! How many numbers are there? Write down all natural numbers from 1 to 100 that contain the digits a) 3, b) 8! How many numbers are there? Enter all two-digit numbers, a) whose tens digit is one larger than the ones digit b) whose ones digit and tens digit are the same! Enter all two-digit numbers, the sum of which is a) 4, b) 6, c) 12! Note You get the total number of digits by adding up all the digits of a number. E.g. the number of digits of 26 is 2 + 6 = 8; the number of 3 085 is 3 + 0 + 8 + 5 = 16. Enter all three-digit numbers with the number a) 3, b) 4! Tim says, "The bigger a number is, the greater the sum of its digits." Is Tim right? Find examples or counter-examples! There is a sign on a playground that reads: "For all children younger than 12 years". a) Indicate the maximum age children can have to play on this playground! b) How do you have to reformulate the label so that 12-year-olds can still play? Use the language module for this! The following is written on a roller coaster at the fair: “Only people who are at least 140 cm tall are allowed to ride!” A) Who can ride? Give the height with the help of an inequality! b) People who are 140 cm tall are not allowed to ride on another roller coaster. What does the sign have to say here? Use the language module for this! 57 AD OI 58 AD OI 59 AD OI 60 AD OI 61 AD OI 62 AD OI 63 AD OI 64 AD OI 65 AD OI The signs "<", ">", "≤" and "≥" can be used with certain words in our everyday lives - be assigned to the language: "<": ">": "≤": "≥": younger than, less than, lighter than older than, greater than, heavier than at most, up to years at least, from years of age Language module 66 AD OI 67 AD OI 68 AD OI For testing purposes only - property of publisher öbv

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