Colorful Mathematics
Mathematics 6.
Textbook
Imosoft Kft.
MS2306EN  Edition 1, 2014  304 pages
Authors: Mihály Csordás, László Konfár, Jánosné Kothencz, Ágnes Kozmáné Jakab, Klára Pintér, Istvánné Vincze

Divisibility
 1. The divisors and multiples of natural numbers (review) 10
 2. Look at the remainder 15
 3. The divisibility of the sum, the difference and the product 19
 4. Rules of divisibility 27
 5. Divisibility based on the sum of the digits 34
 6. Further divisibility rules 38
 7. Primes and compound numbers 42
 8. Writing compound numbers as the product of primes 46
 9. Common divisors, greatest common divisor 50
 10. Common multiples, lowest common multiple 55
 11. Mixed exercises 59

How to solve problems?

Rational numbers I.

Axial symmetry
 Axial symmetry in our environment 134
 Axially symmetric triangles 138
 Axially symmetric polygons and the circle 143
 Using the ruler and compass 151
 Constructing perpendicular lines 156
 Constructing parallel lines 161
 Constructing, copying and bisecting angles 165
 Constructing the axially symmetric images of figures 171
 Constructing axially symmetric polygons 177
 Mixed exercises 183

Rational numbers II.