Long Multiplication (TU x TU) Stage 3 Grid Multiplication Column multiplication (Expanded method into standard) Extend the grid method to TU × TU, Children should only use the ‘standard’ asking children to estimate first so that column method of long multiplication if they they have a general idea of the answer. can regularly get the correct answer using this (43 × 65 is approximately 40 × 70 = 2800.) method. As mentioned earlier, the grid method is often the of many children in ‘choice’ Years 5 and 6, due to its ease in both There is no regarding the position of the ‘rule’ procedure and understanding / place Each choice has advantages and ‘carry’digits. value and is the method that they will complications. mainly use for simple long multiplication Either the digits mentally or have your own calculations. favoured position for these digits. For 3 x 2 digit calculations, grid Most children, at this point, should be method is quite inefficient, and has much encouraged to choose the standard method. scope for error due to the number of For 3 digit x 2 digit calculations it is especially that need to be added. efficient, and less prone to errors when mastered. Use this method when you find the Although they may find the grid method easier standard method to be unreliable or to apply, it is much slower / less efficient. difficult to remember.
Stage 3 Long Multiplication (TU x TU) Grid Multiplication Column multiplication (Expanded method into standard) Extend the grid method to TU × TU, asking children to estimate first so that they have a general idea of the answer. (43 × 65 is approximately 40 × 70 = 2800.) As mentioned earlier, the grid method is often the ‘choice’ of many children in Years 5 and 6, due to its ease in both procedure and understanding / place value and is the method that they will mainly use for simple long multiplication calculations. Children should only use the ‘standard’ column method of long multiplication if they can regularly get the correct answer using this method. There is no ‘rule’ regarding the position of the ‘carry’digits. Each choice has advantages and complications. Either the digits mentally or have your own favoured position for these digits. For 3 x 2 digit calculations, grid method is quite inefficient, and has much scope for error due to the number of that need to be added. Use this method when you find the standard method to be unreliable or difficult to remember. Most children, at this point, should be encouraged to choose the standard method. For 3 digit x 2 digit calculations it is especially efficient, and less prone to errors when mastered. Although they may find the grid method easier to apply, it is much slower / less efficient.
Calculation_Policy_September_2018.docx