This document provides an index and table of contents for a mathematics textbook. The index lists chapter titles about measuring areas, units for measuring areas, calculating the areas of rectangles, and calculating areas in everyday life. It also lists introductions about the purpose of mathematics and how to use the textbook.

1. Í ndice
P R E S E N TA C I Ó N
¿ PA R A Q U É S I RV E N L A S M AT E M Á T I C A S ? 8
¿ C Ó M O U S A R E S T E L I B RO ? 10
G U Í A PA R A D O C E N T E S 12
2 0 E N M AT E . C O M E S PA R A Q U E M E J O R E S E N M AT E M Á T I C A S 15
I Á R E A S Y VO L U M E N E S 17
1 MEDICIÓN DE ÁREAS 18
2 U N I D A D E S PA R A M E D I R Á R E A S 20
3 Á R E A Y P E R Í M E T RO D E R E C T Á N G U L O S 23
4 C Á L C U L O D E Á R E