Test your mental strategies:
Examples:
Addition and Subtraction:
39 + 34
1. Keep 39 in your mind.
2. Partition 34 into 30 and 4.
3. Add 39 and 30, which is 69.
4. Then, add 69 to 4, which is 73.
Multiplication:
15 x 12
1. Keep 15 in your mind.
2. Partition 12 into 10 and 2.
3. Multiply 15 by 10, which is 150.
4. Multiply 15 by 2, which is 30.
5. Add 150 and 30, which is 180.
Now try the following questions. Some of the questions involve three digit numbers.
Addition:
1) 85 + 45 6) 123 + 54 11) 254 + 73
2) 63 + 56 7) 345 + 65 12) 646 + 82
3) 67 + 68 8) 543 + 68 13) 522 + 45
4) 84 + 47 9) 312 + 74 14) 184 + 62
5) 48 + 32 10) 453 + 47 15) 585 + 38
Subtraction:
1) 87 - 45 6) 150 - 84 11) 245 - 67
2) 60 - 23 7) 435 - 67 12) 642 - 93
3) 82 - 28 8) 248 - 85 13) 146 - 83
4) 59 - 25 9) 326 - 47 14) 232 - 75
5) 64 - 48 10) 217 - 92 15) 346 - 64
Multiplication:
1) 87 x 12 6) 45 x 21
2) 24 x 15 7) 45 x 17
3) 45 x 13 8) 29 x 15
4) 39 x 14 9) 54 x 13
5) 27 x 16 10) 36 x 18
Adding and subtracting numbers ending with 9:
Example: 26 + 19
1. Round 19 to the nearest ten, which is 20.
2. Add 26 and 20, which is 46.
3. Take away 1 from 46, which is 45.
Example: 45 - 19
1. Round 19 to the nearest ten,which is 20.
2. Subtract 20 from 45,which is 25.
3. Add add 1 to 25, which is 26.
Try answering the following questions:
1) 44 + 29 6) 45 + 49 11) 63 + 19
2) 56 + 39 7) 56 + 19 12) 76 + 29
3) 63 + 29 8) 82 + 29 13) 75 + 49
4) 68 + 49 9) 41 + 19 14) 67 + 69
5) 75 + 19 10) 73 + 39 15) 87 + 19
1) 44 - 29 6) 45 - 19
2) 56 - 39 7) 56 - 19
3) 63 - 29 8) 82 - 29
4) 68 - 49 9) 41 - 19
5) 75 - 19 10) 73 - 39
Saturday, 11 June 2016
Synonnyms - 11 Jun
Synonyms
1. change m - - i f -
2. ceremony - i t - a -
3. chaos - a - h - m
4. prospect c - a n - e
5. charming a - p - - l - n g
6. cheeky i m - u - e n t
7. choke s - f f - - a - e
8. hygiene c - - a - l - n - s
9. comment r - m - - k
10. compliment a p - r - - - a - e
11. collapse t - - b - e
12. objection - r - - e - t
13. chaotic d i - o - d - - l y
14. colourful v - b - r - n t
15. complicated - l - b - r - - e
16. conquer - v - r - - m r
17. conceited a - - o g - n t
18. commit - e - f - r m
19. consequence o - t - - m e
20. convince a - - u r -
21. contempt h - - r - d
s - o - n
d - - g - s t
d - - l - k e
22. cruel b - u - a l
s - v - g -
b - r b - r - c
23. prominent n - t - b - e
24. obvious a - - a - e - t
25. uncanny s - r - n g e
m y s - e - i - - s
26. precarious d - n - e r - - s
27. derelict d - l - p - d - - e d
28. desolate l - - e - y
29. defy r e - - s t
d i - o b - y
30. contradict d - - p - t e
d - s a - r - -
31. deceitful d - - h - e s t
32. defiant o - - t - n - t e
s - - b b - r n
33. deliever s - p p - y
d - s t r i - u t e
c - n - - y
34. detest h - - e
l - - t - e
35. devoted d - - i - a - e d
c o - - i a - e d
36. ardous - - f f - c - - t
37. dignified n - - - e
d - s - - n g - - s h - d
38. dingy d - - m - l
g - o o - y
d - l - - y
39.tragedy - - s h - p
40. sceptical d - - b t - - l
u n - - r - - i n
1. change m - - i f -
2. ceremony - i t - a -
3. chaos - a - h - m
4. prospect c - a n - e
5. charming a - p - - l - n g
6. cheeky i m - u - e n t
7. choke s - f f - - a - e
8. hygiene c - - a - l - n - s
9. comment r - m - - k
10. compliment a p - r - - - a - e
11. collapse t - - b - e
12. objection - r - - e - t
13. chaotic d i - o - d - - l y
14. colourful v - b - r - n t
15. complicated - l - b - r - - e
16. conquer - v - r - - m r
17. conceited a - - o g - n t
18. commit - e - f - r m
19. consequence o - t - - m e
20. convince a - - u r -
21. contempt h - - r - d
s - o - n
d - - g - s t
d - - l - k e
22. cruel b - u - a l
s - v - g -
b - r b - r - c
23. prominent n - t - b - e
24. obvious a - - a - e - t
25. uncanny s - r - n g e
m y s - e - i - - s
26. precarious d - n - e r - - s
27. derelict d - l - p - d - - e d
28. desolate l - - e - y
29. defy r e - - s t
d i - o b - y
30. contradict d - - p - t e
d - s a - r - -
31. deceitful d - - h - e s t
32. defiant o - - t - n - t e
s - - b b - r n
33. deliever s - p p - y
d - s t r i - u t e
c - n - - y
34. detest h - - e
l - - t - e
35. devoted d - - i - a - e d
c o - - i a - e d
36. ardous - - f f - c - - t
37. dignified n - - - e
d - s - - n g - - s h - d
38. dingy d - - m - l
g - o o - y
d - l - - y
39.tragedy - - s h - p
40. sceptical d - - b t - - l
u n - - r - - i n
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