Te Kete Ipurangi
Communities
Schools

Te Kete Ipurangi user options:

Level Two > Number and Algebra

You Don't Need the Number

Achievement Objectives:

Specific Learning Outcomes:

Solve addition problems by using compatible numbers.

Description of mathematics:

Number Framework Stage 5

Required Resource Materials:
Tens and ones place-value material
Activity:

Using Materials

Problem: “Jean has 45 lollies. She eats 4 of them. Now her grandmother gives her 4 more lollies.How many lollies does Jean have now?”

Write 45 – 4 + 4 on the board. Get the students to model the story with counters. Write the answer on the board.

Examples: Word stories and recording for: 43 + 5 – 5

26 – 6 + 6
52 – 3 + 3
14 + 8 – 14
34 + 3 – 34 ...

Using Imaging

Problem: “Gavin has 56 apples. He eats 6 of them. He buys 6 more apples. How many apples does Gavin have now?”

Shield 56 objects from the students. Show them the 6 Gavin eats. “How many are left?” Add 6 more to the shielded apples. Ask how many there are now.

Examples: Word stories and recording for: 25 + 4 – 4

58 – 7 + 7
28 + 15 – 28
23 – 9 + 9 ...

Using Number Properties

Examples: Word stories for: 345 + 907 – 907

234 + 69 – 234
689 – 341 + 341
345 + 89 – 345 ...

Understanding Number Properties:

Find the answer to 500 – ? + ?, where the number is the same in both boxes. Would it matter what number went in the boxes? (Answer: No. Whatever number is in the boxes, the answer is always 500.)

Similar Resources

Solve subtraction problems by using addition.

Solve subtraction problems by using addition.

Close to 100

Recall the number of tens and hundreds in 100s and 1000s.

Identify symbols for any fraction, including tenths, hundredths, thousandths, and those greater than 1.

Solve addition and subtraction problems using decomposition, leading to a written algorithm

A Standard Written Form for Addition

Solve addition and subtraction problems using decomposition, leading to a written algorithm.

Multiple Ways to Add and Subtract

Use multiplication to solve addition and subtraction problems.