Stage 4 4/2 Round to nearest 10, 100, 1000, PROMPT sheet Example 1– Round 4279 to the nearest 1000 Step 1 – Find the ‘round-off digit’ - 4 4/1 Count in multiples Step 2 – Look one digit to the right of 4 - 2 Now you must learn these multiples 5 or more? NO – leave ‘round off digit’ unchanged Multiples Multiples Multiples Multiples - Replace following digits with zeros of 6 of 7 of 9 of 25 6 7 9 25 ANSWER – 4000 12 14 18 50 Example 2– Round 4279 to the nearest 10 18 21 27 75 Step 1 – Find the ‘round-off digit’ - 7 24 28 36 100 Step 2 – Look one digit to the right of 7 - 9 30 35 45 125 5 or more? YES – Add one to the ‘round off digit’ 36 42 54 150 - Replace following digits with zeros 42 49 63 175 48 56 72 200 ANSWER – 4280 54 63 81 225 4/3 Negative numbers 60 70 90 250 Negative numbers are numbers BELOW ZERO 4/2 Find 1000 more or less Think of a number line Horizontal number line tens units hundreds thousands Vertical number line 4 5 6 7 To increase or 4/4 Place value decrease by 1000 this is the digit that changes. tens units hundreds thousands 3 7 4 8 3000 tens tens units units 700 hundreds hundreds thousands thousands 40 8 3 5 6 7 5 5 6 7
Stage 4 PROMPT sheet 4/1 Count in multiples Now you must learn these multiples Multiples of 6 Multiples of 7 Multiples of 9 Multiples of 25 6 7 9 25 12 14 18 50 18 21 27 75 24 28 36 100 30 35 45 125 36 42 54 150 42 49 63 175 48 56 72 200 54 63 81 225 60 70 90 250 4/2 Find 1000 more or less thousands hundreds tens units 4 5 6 7 To increase or decrease by 1000 this is the digit that changes. thousands hundreds tens units 5 5 6 7 thousands hundreds tens units 3 5 6 7 4/2 Round to nearest 10, 100, 1000, Example 1– Round 4279 to the nearest 1000 Step 1 – Find the ‘round-off digit’ - 4 Step 2 – Look one digit to the right of 4 - 2 5 or more? NO – leave ‘round off digit’ unchanged - Replace following digits with zeros ANSWER – 4000 Example 2– Round 4279 to the nearest 10 Step 1 – Find the ‘round-off digit’ - 7 Step 2 – Look one digit to the right of 7 - 9 5 or more? YES – Add one to the ‘round off digit’ - Replace following digits with zeros ANSWER – 4280 4/3 Negative numbers Negative numbers are numbers BELOW ZERO Think of a number line Horizontal number line Vertical number line 4/4 Place value thousands hundreds tens units 3 7 4 8 3000 700 40 8