The document contains a collection of math problems and exercises including: 1) Adding 3-digit numbers mentally with sums up to 300 2) Calculating the total number of trees in an orchard containing avocados, mangoes, and santol trees 3) Multiple examples of adding 2-digit numbers mentally 4) An evaluation section asking to solve equations mentally 5) An assignment with additional 2-digit number addition problems

1. Mathematics IV

2. A birdin the handis worth two in the bush
It is better to keep something of
lower value which we already have
than risk for something of higher-value
of which we are not certain of getting.

3. Adding mentally 3- digit numbers
with sums up to 300

4. 9 + 7

5. 4 + 7

6. 8 +15

7. 25 + 30

8. 10 + 20

9. 18 + 28

10. 8 + 6

11. 50 + 70

12. 40 + 20

13. 18 +17

14. 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

17. In an orchard, there are 125
Avocados and 173 Mango and santol
tress. 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

19. 246
+ 52

20. 270
+ 25

21. 153
+ 136

22. 146
+ 150

23. 134
+ 45

24. 278
+ 10

25. 189
+ 100

26. 164
+ 133

27. 123
+ 76

28. 265
+ 34

29. Evaluation:
Solving the equation mentally

30. 115
+ 174

31. 213
+ 182

32. 241
+ 50

33. 186
+ 111

34. 153
+ 146

35. 148
+ 151

36. 175
+ 124

37. 102
+ 191

38. 237
+ 22

39. 286
+ 11

40. 160
+ 134

41. 178
+ 121

42. 283
+ 12

43. 195
+ 101

44. 152
+ 143

45. 226
+ 43

46. Assignment:
Find the sum by adding mentally.
a) 131 b) 150 c) 123
+128 + 46 + 175
d) 205 e) 121
+ 92 + 77

47. GOD BLESS
A birdin the handis worth two in the bush