Report

Written Calculation Methods for KS1 Addition Addition Step 1 •To find one more than a number. •To combine groups of up to 10 objects and label. •To count on using fingers. •To count on using a number line starting with the largest number. • Step 2 • Begin to use the + and = sign to record number sentences. Step 3 • Use a number line and then an empty number line to add a 2 digit number and a 1 digit number. • Use a hundred square and then an empty number line to add a 2digit number and a multiple of 10. • 32 + 10 = 42 • Add multiples of 10 by going down a row on the 100 square. Subtraction Subtraction Step 1 Find one less than a number. Take objects away and label up to 10. Take away on fingers. Count back using a number line. Draw objects and cross out. Step 2 Begin to use the – and = sign to record number sentences. Step 3 • Find the difference with numbers up to 20, by counting up, using visual objects, bead strings and towers of unfix. • Write finding the difference number sentences using the – and = sign appropriately. • 14-11=3 the difference between 11 and 14 is 3. Step 4 • To subtract a 1 digit number from a 2 digit number by counting back on an empty number line using a 100 square as a visual prompt. Step 5 •Subtract 10 and multiples of 10 from a 2 digit number by counting back. •Use 100 square and teach the rule of jumping up 1 row when subtracting 10. . Multiplication Step 1 •Counting in 10’s, 2’s and 5’s. •To know the doubles and corresponding halves to 10 and then 20. Step 2 •To understand multiplication as repeated addition. Arrays. 2x4= 4x2= + + + Arrays on a number line + Using a multiplication grid. When using a multiplication grid we will teach the children to use the grid vertically for first number and horizontally for second number as this follows the same principle of arrays. 2x4=8 Division Division • Step 1 • Count back in 10’s, 2’s and 5’s. • Know halves of numbers to 10 and then 20. Step 2 • To understand division as grouping. • Understand division as repeated subtraction using a number line. • 18 ÷ 3 = 6 • Reinforce division as grouping through arrays. • 6÷3=2 • 6 divided into groups of 3 is 2. Number facts 1. Addition facts to 10, 6+4=10 2. Addition can be done in any order 6+4=10 and 4+6=10 3. Subtraction facts from 10, if I know 6+4=10 then 10-6=4 4. Then this progression repeats for facts to 20 (16+4=20) and to 100 in multiples of 10 (60+40=100) Any questions?