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Adding Tens and Ones

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Achievement Objectives
NA2-1: Use simple additive strategies with whole numbers and fractions.
AO elaboration and other teaching resources
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 ...

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Level Two