Unit 1A • Chapter 1
Place value and rounding
You will learn how to: • Interpret decimal notation and place value. • Multiply and divide whole numbers and decimals by 10, 100 or 1000. • Order decimals including measurements, changing these to the same units. • Round whole numbers to the nearest 10, 100 or 1000 and decimals, including measurements, to the nearest whole number or one decimal place.
Starting point Do you remember …? • what each digit represents in numbers with up to 6 digits? For example, what does each digit represent in the number 724 568? • what each digit represents in numbers with up to 2 decimal places? For example, what does each digit represent in the number 0.43? • how to multiply and divide whole numbers by 10, 100 or 1000 where the answer is a whole number? For example, calculate 234 × 100 or 7 500 ÷ 10. • how to round simple whole numbers to the nearest 10, 100 or 1000 and how to round decimals to the nearest whole number or one decimal place? For example, round 78 to the nearest 10. • the relationships between different units of measurement? For example, how many centimetres are in 2 metres? This will also be helpful when … you learn how to do more complex calculations with decimals, such as multiplying and dividing by decimals.
Hook Here is a game for 2–4 players. You will need paper, pens and a die. Aim of the game: to produce the largest number Each player draws 4 boxes like this, with a decimal point as shown:
Player 1 then rolls the die. All the players must write the number on the die in one of their four boxes. Player 2 then rolls the die. All the players must write the number on the die in one of their remaining three boxes. Play continues twice more, rolling the die and then writing the number in a box. Once all four boxes are complete, the players compare their numbers and the player with the largest number wins.
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Unit 1A: Number and calculation
239861 Checkpoint Maths Stage 7 SB_CH1.indd 2
8/17/17 1:24 AM