Achievement Objectives

NA2-1: Use simple additive strategies with whole numbers and fractions.

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

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 ...

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 ...

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 ...