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Calculations
24-29 Understanding addition and subtraction
Understand the operation of addition, and of subtraction (as 'take away', 'difference', and 'how many more to make'), and use the related vocabulary.
Begin to recognise that addition can be done in any order.Begin to use the +, - and = signs to record mental calculations in a number sentence, and to recognise the use of symbols to stand for an unknown number. (p.24,28)Counting machine, counts in 1's ,2's, 5's, 10's
Interactive snakes and ladders game. One player option allows use with whole class. Great opportunity for effective questioning
Use moveable digit cards to make algorithm / statement true
Begin to recognise that more than two numbers can be added together. (p.26)
Know by heart:
all pairs of numbers with a total of 10 (e.g. 3 + 7);addition facts for all pairs of numbers with a total up to at least 5, and the corresponding subtraction facts;
addition doubles of all numbers to at least 5 (e.g. 4 + 4).
Begin to know:addition facts for all pairs of numbers with a total up to at least 10, and the corresponding subtraction facts. (p.30)Allows practice of number bonds - to 5, 10, 100 or set your own.
Fun activity to find the doubles of numbers up to 10
Visual representation of comparison 10/20. Demonstrates subtraction through modelling removal of counters
Ambleside: NumberBond Machines
Use knowledge that addition can be done in any order to do mental calculations more efficiently. For example:
put the larger number first and count on in ones, including beyond 10 (e.g. 7 + 5);
begin to partition into '5 and a bit' when adding 6, 7, 8 or 9, then recombine (e.g. 6 + 8 = 5 + 1 + 5 + 3 = 10 + 4 = 14). (p.32)Game 1: Ordering number cards and identifying one more, one less. Very similar to maths intervention type activities
Game 2: Screen showing ten butterflies, ‘x' fly away, how many remain? Grid partitioned into five and a bit.Count Me In
Game One
Game TwoIdentify near doubles, using doubles already known(e.g. 6 + 5). (p.32) Add 9 to single-digit numbers by adding 10 then subtracting 1. (p.34) Interactive number square, allows change of number of columns and start number Use patterns of similar calculations(e.g. 10 - 0 = 10, 10 - 1 = 9, 10 - 2 = 8). (p.34) Use known number facts and place value to add or subtract a pair of numbers mentally within the range 0 to at least 10, then 0 to at least 20. (p.36,38) Begin to bridge through 10, and later 20, when adding a single-digit number. (p.40)
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This page was last updated on Wednesday, 22 December, 2004