Singapore Math Level 3A & 3B – Mid-Review: Adding, Subtracting, Multiplying, Dividing With Mental Calculations - 40 Questions
MID-REVIEW: ADDING, SUBTRACTING, MULTIPLYING, DIVIDING WITH MENTAL CALCULATIONS
Q(1-2): Write
the following words as numbers.
1. seven
thousand, three hundred
2. four
thousand, forty
Answer(1-2):
1. 7,300
2. 4,040
Q(3-4): Write
the following numbers as words.
3. 5,015
4. 6,411
Answer(3-4):
3. five
thousand, fifteen
4. six
thousand, four hundred eleven
Q(5-9):
Solve the following problems.
5. Find the
sum of 3,618 and 2,934 (add 3,618 & 2,934).
Solution(5):
6552
The sum is 6,552.
6. Find the
difference between 4,372 and 2,465 (Subtract 2,465 from 4,372).
Solution(6):
- 2 4 6 5
1 9 0 7
The
differece is 1907
7. Multiply
149 by 7 (149×7=?).
Solution(7):
× 7
1,043
8. Find the
remainder: 863 ÷ 8.
Solution(8):
8)863
8
6
0
63
56
7
The
remainder is 7.
9. Add 16
and 25 mentally.
Solution(9):
25 + 16
= 25 + 20 –
4
= 45 – 4
= 41 (Ans.)
Q(10-15): Solve
the following problems. Show your work.
+ 4,623
11. 9,000
– 4,515
12. 7)800
13. 8,230
– 1,965
14. 414
× 8
Solution(10-15):
+ 4,6 2 3
8,5 1 4
11. 8 9 9 10
– 4,5 1 5
4,4 8 5
12. 114
7)800
7
10
7
30
28
2
13. 7 11 12 10
– 1,9 6 5
6,2 6 5
14. 14314
× 8
3,3,12
15. 78
4)312
28
32
32
0
16. Arrange these
numbers in order of smallest to largest.
6302, 4263,
8143, 2436
Answer:
2436, 4263, 6302, 8143
17. Use greater
or smaller to complete the sentence.
5920 is __
than 5820.
Answer(17): 5920
is greater than 5820.
18. Look at
the picture carefully and make 2 multiplication and 2 division sentences.
🎂 🎂 🎂 🎂 🎂 🎂 🎂 🎂 🎂 🎂 🎂 🎂 🎂 🎂
🎂 🎂 🎂 🎂 🎂 🎂 🎂 🎂 🎂 🎂 🎂 🎂 🎂 🎂
Answer(18):
6 × 7 = 42
7 × 6 = 42
42 ÷ 6 = 7
42 ÷ 7 = 6
19. Complete
the pattern and show your work.
2017,__ ,__
, 2317, 2417
Solution(19):
2417 – 2317
= 100
So, 2017 +
100 = 2117
2117 + 100 =
2217
The
completed pattern is: 2017, 2117, 2217, 2317, 2417
20. Fill in
the blanks.
(a) There
are …….. groups of baskets.
(b) There
are …….. baskets in each group.
(c) There
are …………… baskets altogether.
Solution(20):
(a) 8
(b) 3
(c) 24 [8 × 3=24]
Q(21-25): Solve
the following word problems. Show your work in the space below.
21. James
has 8 bags of mangoes. There are 55 mangoes in each bag. He then packs all the
mangoes into 2 bags equally. How many mangoes are there in each bag?
Solution(21):
55 × 8 = 440
440
There are
440 mangoes altogether.
440 ÷ 2 =
220
2)44
4
4
4
0
There are 220
mangoes in each bag.
22. Amrita
has 316 seashells. Rachel has 3 times as many seashells as Amrita. Carson has
400 fewer seashells than Rachel. How many seashells does Carson have?
Solution(22):
316 × 3 =
948
× 3
948
948 – 400 =
548
- 400
548
Carson has 548
seashells.
Solution(23):
(a)
1416 + 165 =
1581
+165
1581
His home is 1581
yd. away from the library.
(b)
1581 × 2 =
3,162
3 1 6 2
He walks 3162
yd.
24. The
distance from City A to City B is 138 km. There are 3 train stops equally
spaced between the two cities. If Monica boards the train at the first stop and
gets off at the second stop, how far will she travel?
Solution(24):
138 ÷ 2 = 69
2)138
12
18
18
0
She will
travel 69 km.
25. Olivia
paid $1450 for a piece of furniture. She paid twice as much for another piece
of furniture. If she gave the cashier $5,000, how much change would she
receive?
Solution(25):
$1450 × 2 =
$2900
× 2
2900
Olivia paid
$2900 for the 2nd piece of furniture.
$2900 +
$1450 = $4350
4350
$5000 – $4350
= $650
-43 5 0
650
She would
receive $650 in change.
Also: