Year 3 Block A – Counting, partitioning and calculating
The focuses of mathematics learning within this block are:
 Addition and subtraction
 Mental methods: 1 and 2digit numbers
 Written methods: 2 and 3digit numbers
 Reading, writing, ordering, partitioning and rounding 2 and 3digit numbers
 Solving one and twostep word problems involving numbers, money or measures
 Explaining methods and reasoning, orally and on paper
 Multiplication and division
 Multiplying 1 and 2digit numbers by 10 or 100
 Informal written methods: multiplying and dividing TU by U; rounding remainders
The objectives for the block are listed in the table – the right hand column indicates how the objectives might be addressed in the units
Objectives 
Unit 1 
Unit 2 
Unit 3 
Solve one–step and two–step problems involving numbers, money or measures, including time, choosing and carrying out appropriate calculations




Describe and explain methods, choices and solutions to puzzles and problems, orally and in writing, using pictures and diagrams




Read, write and order whole numbers to at least 1000 and position them on a number line; count on from and back to zero in single–digit steps or multiples of 10




Partition three–digit numbers into multiples of 100, 10 and 1 in different ways




Round two–digit or three–digit numbers to the nearest 10 or 100 and give estimates for their sums and differences




Derive and recall all addition and subtraction facts for each number to 20, sums and differences of multiples of 10 and number pairs that total 100




Add or subtract mentally combinations of one–digit and two–digit numbers




Develop and use written methods to record, support or explain addition and subtraction of two–digit and three–digit numbers




Derive and recall multiplication facts for the 2, 3, 4, 5, 6 and 10 times–tables and the corresponding division facts; recognise multiples of 2, 5 or 10 up to 1000




Multiply one–digit and two–digit numbers by 10 or 100, and describe the effect




Use practical and informal written methods to multiply and divide two–digit numbers (e.g. 13×3, 50÷4); round remainders up or down, depending on the context



