A Standard Written Form for Addition
Achievement Objectives
NA3-1: Use a range of additive and simple multiplicative strategies with whole numbers, fractions, decimals, and percentages.
Specific Learning Outcomes
Solve addition and subtraction problems using decomposition, leading to a written algorithm.
Description of Mathematics
Number Framework Stage 6
Activity
Problem: “Work out 235 + 386 in a standard written method.”
Record the following on the board or modelling book and discuss the reason for every step.
Examples: 234 + 478 459 + 328 308 + 536 889 + 67 ...
Using Imaging
Problem: “Find 235 + 487 by a standard written method.
Use a compact form
Discuss how five and seven produce two ones and one 10 and 12 tens produce two tens and one hundred.
Examples: 484 + 468, 279 + 326, 508 + 536, 89 + 557, 367 + 902, 78 + 970 ...
Using Number Properties
Examples: Find the answers by using a standard written form: 3 404 + 478, 4 079 + 2 327, 588 + 4 536, 59 + 4 556, 3 268 + 8 902, 78 + 970 ...