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Mathematics IV
A bird in the hand is worth two in the bush
It is better to keep something oflower value which we already havethan risk for something of higher-valueof which we are not certain of getting.
Adding mentally 3- digit numberswith sums up to 300
9 + 7
4 + 7
8 +15
25 + 30
10 + 20
18 + 28
8 + 6
50 + 70
40 + 20
18 +17
Estimate the sum of each item orally.
a) 312 b) 143 c) 163 d) 192
+291 +414 +681 +271
e) 676 f) 780 g) 816 h) 136
+215 +342 +415 +415
In an orchard, there are 125Avocados and 173 Mango and santoltress. How many trees are there in all.
1. What kind of trees are found in the orchard?2. Can you name them?3. How would you get the total number of trees
in the orchard?4. Do you need to use a paper and pencil?5. Can you solved for the final answer mentally
246
+ 52
270
+ 25
153
+ 136
146
+ 150
134
+ 45
278
+ 10
189
+ 100
164
+ 133
123
+ 76
265
+ 34
Evaluation:Solving the equation mentally
115
+ 174
213
+ 182
241
+ 50
186
+ 111
153
+ 146
148
+ 151
175
+ 124
102
+ 191
237
+ 22
286
+ 11
160
+ 134
178
+ 121
283
+ 12
195
+ 101
152
+ 143
226
+ 43
Assignment:Find the sum by adding mentally.
a) 131 b) 150 c) 123
+128 + 46 + 175
d) 205 e) 121
+ 92 + 77
GOD BLESS
A bird in the hand is worth two in the bush
