Place Value, Addition and Subtraction SCITT Day 2 Place Value, Addition and Subtraction

Session objectives (We will): consider the importance of ‘Place Value’ in the teaching of Number; review a range of models and images that can be used to develop understanding; to review the National Curriculum approach to addition and subtraction using mental methods, informal jottings, written methods and calculators; review aspects of measures – estimation, measuring and reading scales.

Associated issues for teaching Review all aspects of your own mental methods of calculation for addition and subtraction Explore the rationale behind the delaying of vertical methods of recording Review a range of Oral and Mental Starters and how to engage learners. Consider simple resources and the role of practical work in the classroom.

Mental Oral Starter Boxes 100 + + + =

Mental and Oral Starters What are they for? How can they be used? What have you seen? What makes a ‘good’ MOS? What do you need to consider if planning a mental/ oral starter?

NC2014 Look at the Statutory and non-statutory expectations for your year group for Place Value, addition and subtraction… Q: Is the language clear? Keep these expectations in mind…!

Models and Images Models and images are visual diagrams or practical objects that can be manipulated to demonstrate a mathematical process or method. What different models and images have you used when teaching Number and Calculation?

Number Track Games Race to the Moon A two player game! You need two counters. Set your number line with START at the ‘bottom’ and 10 at the ‘top’. (Put 10 on a post-it) Who can reach number 10 first? Roll dice and move upwards.

Number Track Games ‘Adds’ vs ‘Takes’ Number track marked 0 – 10 The ‘ball’ starts on 5. One player is ‘adding’, the other ‘taking away’. Who can score a goal? (by reaching 0 or 10 or ‘beyond’!)

Number lines 3 (or 4) in a line One number line (0-100) between 2 or 3 players (marked in divisions, age-appropriate) Player 1 turns over 2 digit cards and make a two-digit number. Place that number where it ‘lives’ on the number line and write their initial above it. Player 2 …. Play continues until one player has 3 places on the line with no other players placed in between.

Other number lines… How could these games work on these number lines: 3 x table line? 50-60? Fractions (0, ½ ,1, 1½…)? Decimals (0, 0.1, 0.2,…)? Negative Nos (-5 to 5)?

1-100 Place a counter over numbers that have significance for you “Hide the number” 1 number A cross (+ or x) 5 random numbers

Define… ‘Place Value’ (with examples)

National Curriculum 2014 What are the end of year expectations for Number & Place Value across the school? (Track from Y1 to Y6) What other strands of mathematics require an understanding of Place Value? (Implicit or explicit)

NC2014 Look at your year group… What models and images would you use to support learners? (regardless of age) [Numicon/ straws/ Dienes/ exchange boards / coins/ PV cards/ number lines/ 0-99 square]

Progression in Calculation Counting Early stages of mental calculation and learning number facts Working with larger numbers and informal jottings Non-standard expanded written methods Standard written methods Is this clear in NC2014? Where do you fit in with this progression?

This document offers an overview of progression and ideas for practising different mental calculation strategies. Four operations + - x ÷

Ian Thompson - 1999 “One of the reasons why teachers should discuss children’s mental strategies in the classroom and get them to try out each other’s methods is to legitimate the use of personal (as opposed to ‘school approved’) strategies. Teachers need to be aware of the range of available methods, not so they can formally teach them, but to enable them to support children who are developing proficiency with a particular strategy…also to ensure that children do not receive advice that confuses rather than clarifies.” http://www.ianthompson.pi.dsl.pipex.com/index_files

Consider When vertical methods are first introduced learners need to see them alongside related mental methods. It is important that the children have a good understanding of place value and partitioning using concrete resources and visual images to support calculations. The expanded method enables children to see what happens to numbers in the standard written method.

Explore… 36 + 35 = 72 – 38 = 45 + 37 = 83 – 46 = Work these out ‘mentally’ or with a written method on your own, then share your methods with your table. Please feel free to record in any way you find useful. (In carrying out the calculation or in explaining to others.)

Calculators Main roles A calculating aid A learning aid An aid for generating mathematics

Not only but also Calculators can be used as a teaching aid to promote mental calculation and the development of mental strategies Calculators can stimulate problem solving…concepts otherwise inaccessible

And finally Whenever a calculator is used they should ask themselves questions such as What numbers do I need to enter? In what order do I key in the numbers? Do I have to add, subtract, multiply or divide? Does the result make sense? How do I interpret the display?

Measuring Instruments What range of measuring instruments are there? Similarities? Differences? What aspects of measure? Units? Length Time Weight ….

Reading Scales Reading Scales is just applying knowledge of number lines…? Isn’t it? Create a step-by-step set of instructions for children to be able to read scales accurately…using one of the following examples

Task 2: Hand in Day 4 Work with a group of children on a task involving calculation (examples from relevant year group expectations). What different calculation strategies/ methods are they familiar with? Discuss with pupils different models & images they utilise to explain HOW they did the calculations? (With KS2 children you might be able to explore alternative methods and discuss ‘efficiency’.)

Task 2: WILF OUTCOMES be aware of the range of calculations that children might do mentally and/or with paper and pencil recording listen to children’s explanations/ reasoning annotate children’s work to show their thinking consider next steps (including other models and images you could/would introduce) show an awareness of any errors/ misconceptions and how they may be addressed

Did we? consider the importance of ‘Place Value’ in the teaching of Number? review a range of models and images that can be used to develop understanding? to review the National Curriculum approach to addition and subtraction using mental methods, informal jottings, written methods and calculators? review aspects of measures – estimation, measuring and reading scales.