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# Year 3 Block A – Counting, partitioning and calculating

## The focuses of mathematics learning within this block are:

• Mental methods: 1- and 2-digit numbers
• Written methods: 2- and 3-digit numbers
• Reading, writing, ordering, partitioning and rounding 2- and 3-digit numbers
• Solving one- and two-step word problems involving numbers, money or measures
• Explaining methods and reasoning, orally and on paper
• Multiplication and division
• Multiplying 1- and 2-digit 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