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Mathematics Year 4 Practice 1 Numbers and Operations
Estimation Round off numbers
1.3 1.4

13. The diagram below shows the volume of 16. Round off 52 398 to the nearest thousand.
water in container X. The volume of water A 51 000
in container Y is not shown. B 52 000
C 53 000
D 54 000
17. Which number is rounded off to the nearest
X Y
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5 ml hundred correctly?
A 62 598 → 62 500
Estimate the volume of water in container Y. B 59 836 → 59 900
A 1  C 3  C 47 085 → 47 100
B 2  D 4  D 33 764 → 33 700
KBAT
14. The diagram below shows the mass 18. Which of the following numbers when
HOTS rounded off to the nearest thousand does
of rambutan in basket D. The mass of Analysing
rambutan in basket F is not shown. not become 88 000?
A 87 745
B 88 042
C 88 378
D 88 888

Basket D Basket F 19. Determine which number is incorrectly
560 g rambutan
rounded off.
Estimate the mass of rambutan in basket Number Rounded off to the
F. nearest ten thousand
A 100 g C 150 g A 18 365 20 000
B 250 g D 280 g B 32 714 30 000

15. The diagram below shows the number of C 63 889 60 000
books in box M. The number of books in D 75 323 70 000
box N is not shown.
Number patterns
1.5

20. 17 323, 17 423, 17 523, 17 623

The sequence below that has the same
Box M Box N number pattern as the sequence above is
10 books
A 73 238, 73 233, 73 228, 73 223
Estimate the number of books in box N. B 61 495, 61 487, 61 479, 61 471
A 5 C 30 C 48 323, 49 323, 50 323, 51 323
B 10 D 40 D 25 049, 25 149, 25 249, 25 349

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