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Level Two > Number and Algebra

# Saving Hundreds

Specific Learning Outcomes:

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

Solve addition and subtraction problems by using place value partitioning.

Description of mathematics:

Number Framework Stage 5

Required Resource Materials:
Play money (Material Master 4-9).
Activity:

#### Using Materials

Problem: Julia has to save \$400 for a bike. She has \$287 saved. How much more does Julia have to save?

Write 287 + ? = 400 on the board. Select three students and say which student will be in charge of the hundreds, tens and ones. Let the "hundreds" student count out 2 hundreds, the "tens" student count out 8 tens and the "ones" student count out 7 ones.The "ones" student is given 3 ones which he swaps for 1 ten which he gives to the "tens" student and sits down. 3 is recorded on the board. Now the tens student has 9tens and needs to get 1 ten to make 100. When she has 10 tens she swaps it for 1hundred, gives this to the "hundreds" student and sits down. Write 10 on the board. The "hundreds" student receives a hundred. Write 100 on the board. Discuss why the answer to 287 + ? = 400 is 113. Notice that the order in which the extra money isgiven out can be varied. For example the .tens. student may be given \$20 initially.

Students will need to understand why, eventually, this student will have to give one of these ten dollar notes to the bank. Examples. 484 + ? = 500,  345 + ? = 400, 290 + ? = 400, 488 + ? = 600, 67 + ? = 200, …

#### Using Imaging

Shielding and Imaging Only:
98 + ? = 500,  345 + ? = 400, 290 + ? = 400, ? + 488 = 700, ? + 381 = 500, …

#### Using Number Properties

Examples. Word problems and recording for: 106 + ? = 800,  279 + ? = 700, 378 + ? = 1000, 136 + ? = 800, 809 + ? = 900, ? + 378 = 1000

Challenging examples. 2990 + ? = 5000,  546 + ? = 4000, 6 + ? = 8000, ? + 450 = 5000, ?  + 1950 = 9000, …

## How Many Tens And Hundreds?

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

Solve addition and subtraction problems by using place value partitioning.

Find out how many ones, tens, hundreds and thousands are in all of a whole number.

## 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

## Multiplication Smorgasboard

Solve problems using a combination of addition, subtraction, multiplication and division mental strategies.

Solve multiplication and division problems by using place value.

Solve multiplication and division problems by using tidy numbers.

## How many ten dollar notes?

Solve addition and subtraction problems by using place value.