Teaching informal and formal written methods for subtraction but tired of just lists of calculations? Look no further! Included in this package are 20 task cards each with 2 spot the mistake tasks to engage, enrich and extend understanding of column subtraction methods. These are particularly suitable for Grades 5 /6.
8 calculations for each method, 2 on each sheet. Each calculation has an error –incorrect subtraction, amounts not exchanged to the next column etc. Students can identify what is the error, explain clearly the mistake and suggest advice as if they were the teacher. Finally the correct calculation can be written.
Compacted form of the written methods for THHTU - THHTU and 5-digit numbers - 5-digit numbers.
Clear progression as exchanging from many columns is then needed. Progression of skills to compacted decimal subtraction. 2 decimal places and then 3 decimal places. Finally ensuring the opportunity to subtract decimals with differing numbers of digits.
The different methods include:
*THHTU-THHTU compact column subtraction
*5-digit number - 5-digit number compact column subtraction
*TU.th - TU.th compact column subtraction
*TU.thth - TU.thth compact column subtraction
*differing number of digits
The task cards have been made with black line so that they are easy to photocopy and use. Answer sheets included.