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P. 4
8 Jess worked out the answers to two subtractions in different ways.
A
B
114 – 57
171 – 62
114 – 60 = 54
171 – 60 = 111
114 – 57 = 57
171 – 62 = 109
+3
–2
+3
–2
9
Puzzle
a b
explain what Jess did for each one.
Find the answers using either one of Jess’s ways. Say whether you used strategy A or B.
i
282 – 159
ii
151 – 123
iii 468 – 259 iv 2347 – 72
the highest wind speed ever recorded was on Mount Washington, USa.
It was 372 km/h.
the highest wind speed ever recorded in New Zealand was near Wellington. It was 248 km/h.
What is the difference between these two wind speeds?
Wellington
Choose digits from the mask to make these true.
a ???–?8=378
b ???–59=???
In each subtraction you can use a digit only once.
Chapter 2 : aDDING aND SUBtraCtING 9 USING tIDY NUMBerS
