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Maths Unit 1: Place value
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Round 3.8 to the nearest whole number?
4
Round 126.3 to the nearest whole number?
126
Round 105.9 to the nearest whole number?
106
Round 15.6 to the nearest whole number?
16
Round 0.7 to the nearest whole number
1
Round 0.2 to the nearest whole number
0
Round 19 to the nearest ten
20
Round 47 to the nearest ten
50
Round 31 to the nearest ten
30
When do we round up to the nearest whole number?
If the number in the tenths column is 5 or above ( 6, 7, 8, 9) we round up.
When do we round numbers down to the nearest whole number?
If the number the tenths column is 4 or below ( 1, 2, 3) we round down
3.9 ÷ 10 =
0.39
43.2 ÷ 100
0.432
923 ÷ 10 =
92.3
15.2 x 1000
15 200
4.3 x 100
430
4.3 x 10
43
How can we regroup 45?
 
45 = 15 + 15 +15
 
40 + 5
 
30 + 5
 
45 + 10 = 55
What is regrouping?
Regrouping is when we change the way a number decomposed or broken down
Decompose this number: 89 013.12 =
 
80 000 + 9 000 + 10 + 3 + 0.1 + 0.02
 
80 00 + 9 00 + 1 + 3 + 0.1 + 0.02
 
80 000 + 9 000 + 10 + 3 + 0.1 + 0.2
 
80 000 + 9 00 + 13 + 0.1 + 0.02
Compose this number: 6 + 200 + 0.09 =
206.09
What does it mean to compose a number?
When we compose a number, we put it together by adding numbers together
What does it mean to decompose a number?
When we decompose a number, we break it down into separate parts (hundreds, tens, ones)
Which numerals match the number as words: fifty thousand, two hundred point two
 
50 200.2
 
500 002
 
52 200.2
 
5 200.2
What is the value of the 9 in 102.9?
 
9 tenths
 
9 hundredths
 
9 tens
 
9 ones
What is a decimal number?
A decimal number is part of a whole number


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