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# A Standard Written Form for Addition

Achievement Objectives:

Achievement Objective: NA3-1: Use a range of additive and simple multiplicative strategies with whole numbers, fractions, decimals, and percentages.
AO elaboration and other teaching resources

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 ...