Achievement Objectives
NA2-1: Use simple additive strategies with whole numbers and fractions.
Specific Learning Outcomes

Solve addition and subtraction problems by using place value partitioning.

Description of Mathematics

Number Framework Stage 5

Required Resource Materials
Ones and tens materials. E.g. BeaNZ, play money, sticks in bundles
Activity

#### Using Materials

Problem: “Ray has \$34, and he gets \$25 for a birthday present. How much money does Ray have now?”
Record 34 + 25 on the board or modelling book. The students model 34 and 25 using the chosen materials and group the ones and tens.
Discuss the answer and record 34 + 25 = 59 on the board or modelling book.
Examples: Word stories and recording for: 45 + 22 52 + 13 42 + 25 35 + 43
53 + 25 43 + 22 ...

#### Using Imaging

Shielding and Imaging Only: Examples: Word stories and recording for: 14 + 43
31 + 25 23 + 41 24 + 25 32 + 26 38 + 21 13 + 41 25 + 23
44 + 24 ...

#### Using Number Properties

Examples: Word stories and recording for: 87 + 12 73 + 26 24 + 52 16 + 62
81 + 17 ...
Challenging examples: The students will need to understand the meaning of three-digit
numbers to do these: 241 + 21 342 + 44 643 + 21 27 + 210 303 + 44
25 + 510 ...