1. Standard written form for addition I am learning a standard method of doing an addition problem on paper when the numbers are too difficult to find the answer mentally. In your head Numbers are set out directly below each other. e.g. 347 + 265

2. There are 267 students in the junior school and 148 students in the senior school. How many students are there in total? 267 + 148 = ? Step 1: For our first example let’s expand each number and write them underneath each other. 200 + 60 + 7 100 + 40 + 8 Step 2: Add the ones together. 7 + 8 = 15. Fifteen is made up of a ten and a five. Write the 5 in the ones column and carry the 10 to the tens column. 5 10 Step 3: Add the tens together. 10 + 60 + 40 = 110. 110 is made up of one hundred and one ten. Write the 10 in the tens column and carry the 100 to the hundreds column. 10 100 Step 4: Add the hundreds together. 100 + 200 + 100 = 400 400+ + Step 5: Add the bottom line together to get your answer. 400 + 10 + 5 = 415 +

3. Room 7 made 216 paper cranes at the start of the week and another 138 paper cranes at the end of the week. How many paper cranes have they made? 216 + 138 = ? Step 1: Now let’s try the same algorithm without expanding the number. 216 138 Step 2: Add the ones together. 6 + 8 = 14. Put the 4 in the ones column and carry the ten to the tens column. We will record this as a 1 above the tens column (e.g. it is one ten). 4 1 Step 3: Add the tens together.1 (ten) + 1 (ten) + 3 (tens) = 5 (tens) Record 5 tens in the tens column. 5 Step 4: Add the hundreds together.2 (hundreds) + 1 (hundred) = 3 (hundreds) 3 You have now worked out the answer. 354 +

4. Now try these questions on your own. You will need to use pen and paper to record your algorithm. Need some more practise? Try Pg59 of Teacher Tools Addition and Subtraction Book Numeracy resourcesNumeracy resources 1)672 + 319 = ? 2)438 + 247 = ? 3)586 + 348 = ? 4)261 + 179 = ? 5)854 + 128 = ? Click again when you have completed each question and the answer will be displayed. 991 685 934 440 982