add 2 to 3- digit numbers mentally with sums up to 300 with out regrouping

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