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Swedish Rounding

Achievement Objectives:

Achievement Objective: NA3-4: Know how many tenths, tens, hundreds, and thousands are in whole numbers.
AO elaboration and other teaching resources
Achievement Objective: NA4-6: Know the relative size and place value structure of positive and negative integers and decimals to three places.
AO elaboration and other teaching resources

Specific Learning Outcomes: 

Round whole numbers to the nearest 10, 100, or 1000.

Round whole numbers and decimals, with up to two places, to the nearest whole number, or tenth.

Description of mathematics: 

Number Framework Stages 6 and 7

Required Resource Materials: 

Swedish Rounding Number Lines (Material Master 4-26)

Activity: 

Mary’s bill at the supermarket is $102.88. How much does she pay in cash?” Discuss why Swedish rounding is needed. (There are no 1- , 2- or 5-cent coins any more.) Get the students to fill in a number line with 102.80 at one end and 102.90 at the other. Discuss why these are the choices. Fill in the other boxes with 102.81, 102.82, 102.83, 102.84, 102.85, 102.86, 102.87, 102.88, and 102.89. Mark 102.88 with an arrow. Discuss why 102.88 is closer to 102.90. So $102.88 is rounded to $102.90.

 

Repeat rounding with the following amounts. Encourage the students to imagine the answer so that eventually they can do such problems without using the number lines on their sheet:

$345.09, $8.53, $5.61, $75.15, $0.36, $149.99, $65.08, $99.99 ...