Question 15 of 22intermediate🔍 AnalyzeNumerical4 marks
Use the given information to find the values. Share your reasoning with the grade. a) 139 + 175 = 314, so 314 – 175 = ? b) 845 – 394 = 451, so 845 – 395 = ? c) 354 + 167 = 521, so 354 + 168 = ? d) 456 + 209 = 665, so 446 + 219 = ?
(a)
Answer
139
(b)
Answer
450
(c)
Answer
522
(d)
Answer
665
Explanation
(a) If 139 + 175 = 314, then 314 - 175 = 139 (subtraction is the inverse of addition). (b) 845 - 395 = (845 - 394) - 1 = 451 - 1 = 450 (subtracting 1 more gives 1 less). (c) 354 + 168 = (354 + 167) + 1 = 521 + 1 = 522 (adding 1 more gives 1 more). (d) 446 + 219 = (456 - 10) + (209 + 10) = 456 + 209 = 665 (decrease one number by 10 and increase the other by 10, the sum stays the same).