Question 12 of 21intermediate🔧 ApplyNumerical7 marks
Estimate the answers to the nearest hundred. Share your thinking in the class.
(a)
156 + 34
Answer
190, nearest hundred: 200
(b)
125 – 15
Answer
110, nearest hundred: 100
(c)
105 + 195
Answer
300, nearest hundred: 300
(d)
205 + 215
Answer
420, nearest hundred: 400
(e)
500 – 395
Answer
105, nearest hundred: 100
(f)
765 – 567
Answer
198, nearest hundred: 200
(g)
505 + 405
Answer
910, nearest hundred: 900
Explanation
(a) 156 + 34 = 190. Rounding 190 to nearest hundred gives 200. (b) 125 - 15 = 110. Rounding 110 to nearest hundred gives 100. (c) 105 + 195 = 300. This is already a hundred. (d) 205 + 215 = 420. Rounding 420 to nearest hundred gives 400. (e) 500 - 395 = 105. Rounding 105 to nearest hundred gives 100. (f) 765 - 567 = 198. Rounding 198 to nearest hundred gives 200. (g) 505 + 405 = 910. Rounding 910 to nearest hundred gives 900.