Homework 1. Estimate the answers before multiplying. Check your answers with a calculator.
a) 152 × 9
g) 248 × 29
b) 139 × 11
h) 234 × 25
b) 12 228
c) 118 × 19
i) 282 × 17 c) 9 441
d) 147 × 21
j) 195 × 34 d) 6 378
e) 203 × 18
k) 389 × 23
2. Estimate the answers to these and then work out the answers. a) 8 152
3. Now try these. Remember: there could be remainders. a) 1806 ÷ 7 e) 8195 ÷ 6 i) 5796 ÷ 12
b) 3192 ÷ 5 f) 4334 ÷ 11 j) 3438 ÷ 6
= 95 = 203
b) 22 × e) 31 ×
= 154 = 248
c) 3752 ÷ 8 g) 9540 ÷ 10 k) 7384 ÷ 8
e) 11 539
f) 161 × 32
l) 186 × 38 f) 7 623
d) 7526 ÷ 9 h) 8735 ÷ 7 l) 3456 ÷ 9
4. Try these by estimating fi rst and then trying your estimates in the multiplication. a) 19 × d) 29 ×
c) 28 × f) 37 ×
= 168 = 333
5. Now try these. (Hint: none of the answers are bigger than 9.) a) 128 ÷ 16 b) 168 ÷ 24 c) 130 ÷ 26 d) 144 ÷ 36 e) 378 ÷ 42 f) 168 ÷ 56
6. Now try these. Find the remainder by subtracting. a) 234 ÷ 25 b) 189 ÷ 23 c) 275 ÷ 34 d) 394 ÷ 47 e) 468 ÷ 65 f) 617 ÷ 86
7. Now try these. Remember: the fi rst part of your answer will be in the tens column, so you will be estimating by multiplying by a 10 (there could be remainders).
a) 255 ÷ 15 b) 648 ÷ 27 c) 392 ÷ 28 d) 408 ÷ 19 e) 625 ÷ 25 f) 527 ÷ 34
Recap • I can estimate and calculate products.
• I can estimate and calculate quotients. • I can do long division.
88 2-D ShapesOperations 2
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