Work out
482 - 351
482 - 351
Worked Solution & Answer
482 - 351 = 131 B1
Answer: 131
Subtraction — Notes & Worked Examples Show / Hide
Explanation:
To subtract whole numbers or decimals, write the larger number on top and line up the place values and decimal points vertically. When subtracting decimals of different lengths, insert placeholder zeros at the end so both numbers have the same number of decimal places.
Subtract each column from right to left. Never do “smaller take away bigger” by swapping the digits around; instead, borrow (exchange) 1 from the next non-zero column to the left, reducing that digit by 1 and adding 10 to your current column.
Example 1: Work out 5342 − 1658
Solution:
| 45 | 123 | 134 | 122 | |
| − | 1 | 6 | 5 | 8 |
| 3 | 6 | 8 | 4 |
Units: Borrow from 4 → 12 − 8 = 4
Tens: Borrow from 3 → 13 − 5 = 8
Hundreds: Borrow from 5 → 12 − 6 = 6
Thousands: 4 − 1 = 3
Answer: 3684
Example 2: Work out 42.5 − 16.78
Solution:
| 34 | 112 | . | 145 | 100 | |
| − | 1 | 6 | . | 7 | 8 |
| 2 | 5 | . | 7 | 2 |
Write 42.5 as 42.50 first
0.01s: 10 − 8 = 2 (5 becomes 4)
0.1s: 14 − 7 = 7 (2 becomes 1)
Units & Tens: 11 − 6 = 5, 3 − 1 = 2
Answer: 25.72
10 - 9 =
60 - 9 =
30 - 9 =
90 - 9\
60 - 9 =
30 - 9 =
90 - 9\
Worked Solution & Answer
Line up the place-value columns carefully (or follow **BIDMAS** order of operations) to work out the calculation.
1, 51, 21, 81
1, 51, 21, 81
Answer: 1, 51, 21, 81
Work out.
(a) 6.3 + 4.7 [1 mark]
(b) £4.50 - £0.27 [1 mark]
£
Worked Solution & Answer
(a)
6.3 + 4.7 = 11. B1
Answer (a): 11
(b)
4.50 − 0.27 = £4.23. B1
Answer (b): £ 4.23
Work out
(a) Work out 280 ÷ 7
1 (b) Work out 1062 - 438
(a) Work out 280 ÷ 7
1 (b) Work out 1062 - 438
(a) Work out 280 ÷ 7 [1 mark]
Answer
(b) Work out 1062 - 438 [2 marks]
Answer
Worked Solution & Answer
(a)
280 ÷ 7 = 40 B1
Answer (a): Answer 40
(b)
1062 - 438 = 624 M1 A1
Answer (b): Answer 624
Work out
(a) Write down the value of 23
1 (b) Work out 3.45 + 2.07 - 1.3
(a) Write down the value of 23
1 (b) Work out 3.45 + 2.07 - 1.3
(a) Write down the value of 23 [1 mark]
Answer
(b) Work out 3.45 + 2.07 - 1.3 [2 marks]
Answer
Worked Solution & Answer
(a)
23 = 2 × 2 × 2 = 8 B1
Answer (a): Answer 8
(b)
3.45 + 2.07 = 5.52 M1
5.52 - 1.3 = 4.22 A1
5.52 - 1.3 = 4.22 A1
Answer (b): Answer 4.22
Work out
(a) Work out 364.5 + 17.9 - 2.08
5 (b) Work out 9.36 × 2
(a) Work out 364.5 + 17.9 - 2.08
5 (b) Work out 9.36 × 2
(a) Work out 364.5 + 17.9 - 2.08 [2 marks]
Answer
(b) Work out 9.36 × 2 [1 mark]
Answer
Worked Solution & Answer
(a)
First addition: M1
364.50 + 17.90 = 382.40
Then subtraction:
382.40 - 2.08 = 380.32 A1
364.50 + 17.90 = 382.40
Then subtraction:
382.40 - 2.08 = 380.32 A1
Answer (a): Answer 380.32
(b)
9.36 × 2 = 18.72 B1
Answer (b): Answer 18.72
Work out.
(a) 45 × 100 [1 mark]
(b) 37 ÷ 100 [1 mark]
(c) 2.36 + 1.79 [1 mark]
(d) 0.82 - 0.36 [1 mark]
Worked Solution & Answer
(a)
45 × 100 = 4500. B1
Answer (a): 4500
(b)
37 ÷ 100 = 0.37. B1
Answer (b): 0.37
(c)
2.36 + 1.79 = 4.15. B1
Answer (c): 4.15
(d)
0.82 − 0.36 = 0.46. B1
Answer (d): 0.46
Nav found the following table that shows the age, in years, of each of seven cities.
(a) Write down the name of the city with the greatest age. [1 mark]
(b) Write the number 2534 in words. [1 mark]
(c) Write the number 2351 correct to the nearest ten. [1 mark]
(d) Work out the difference between the age of Cadiz and the age of Nanjing. [1 mark]
years
(e) What is the age of Jenin in whole millenniums? [1 mark]
millenniums
Worked Solution & Answer
(a)
5669 is largest B1
Answer (a): Gaziantep
(b)
Two thousand, five hundred and thirty-four
Answer (b): Two thousand, five hundred and thirty-four
(c)
2350
Answer (c): 2350
(d)
3124 – 2516 = 608 B1
Answer (d): 608 years
(e)
4469 ÷ 1000 = 4 whole millenniums B1
Answer (e): 4 millenniums
Cho finds this information about the areas, in square kilometres, of some South American countries.
(a) Which of these countries has the largest area? [1 mark]
(b) Write the number 163 800 in words. [1 mark]
(c) Write down the value of the 7 in the number 406 752 [1 mark]
(d) Write the number 173 626 correct to the nearest thousand. [1 mark]
(e) Work out the difference between the area of Chile and the area of Uruguay. [1 mark]
square kilometres
Worked Solution & Answer
(a)
926 690 = Venezuela B1
Answer (a): Venezuela
(b)
One hundred and sixty-three thousand, eight hundred
Answer (b): One hundred and sixty-three thousand, eight hundred
(c)
700 (or 7 hundreds)
Answer (c): 700 (or 7 hundreds)
(d)
174 000
Answer (d): 174 000
(e)
756 100 – 173 626 = 582 474 B1
Answer (e): 582 474 square kilometres
The table shows the height, in metres, of each of seven volcanoes.
(a) Which of these volcanoes has the greatest height? [1 mark]
(b) Write down the value of the 8 in the number 4585 [1 mark]
(c) Write the number 6046 in words. [1 mark]
(d) Write the number 5137 correct to the nearest hundred. [1 mark]
(e) Work out the difference in the height of the Acamarachi volcano and the height of the Semeru volcano. [1 mark]
metres
Worked Solution & Answer
(a)
6893 is greatest -> Ojos del Salado B1
Answer (a): Ojos del Salado
(b)
8 is in tens column -> 80 B1
Answer (b): 80 (or 8 tens)
(c)
Six thousand and forty-six
Answer (c): Six thousand and forty-six
(d)
5137 -> 5100 B1
Answer (d): 5100
(e)
6046 – 3676 = 2370 B1
Answer (e): 2370 metres