During their first year, children are supposed to solve problems involving counting, adding, subtracting, doubling and halving in the context of numbers, measures and money. In block A of year one, children concentrate on solving problems involving counting and they extend their counting and calculation skills. The children estimate a number of objects that can be checked by counting, begin to understand place value in two-digit numbers, read and write numerals to 20 and beyond, relate addition to counting on and to combining groups and use an increasing range of vocabulary related to addition. In block B of year one, children consolidate their use of patterns and relationships to solve number problems and puzzles. In block C, children take greater responsibility for posing and answering questions. In block D, Children continue to make direct comparison of the length, weight or capacity of two objects without any counting. The children begin to use uniform non-standard units to estimate and then measure length. The children continue to work with money as well as continue to develop the concept of time by ordering the months of the year and reading time to the hour and half hour on a clock. In block E, children continue to solve practical problems involving addition or subtraction, doubling or halving and they record their solutions on a number line or in a number sentence.