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ON THIS PAGE: Solve x and ÷ problems with whole numbers by:
- Using known facts
- Doubling and Halving
- Changing the order to make a x problem easier
- Reversing between x and ÷ to make it easier
- Rounding and Compensating afterwards
- Sharing into equal sets
- X by multiples of ten: tens, hundreds, thousands
1. Solve x and ÷ problems by ... USING KNOWN FACTS
1. Solve x and ÷ problems by ... USING KNOWN FACTS
Book 6
Book 6
Page 104 - 107
Page 118 - 121
Basic Facts Level 3
You'll need a copy of this book
"Factor Puzzles" Page 11
"Factor Puzzles" Page 11
"Stars and Students" Page 12
"Stars and Students" Page 12
"Digital Delights" Page 13
"Digital Delights" Page 13
"Multiple Mirrors" Page 21
"Multiple Mirrors" Page 21
Show how you could use the times table facts below, to work out the new fact
- Use 5 times tables, to work out 6 x 6
- Use 2 times tables, to work out 3 x 8
- Use 10 times tables, to work out 8 x 9
- Use 5 times tables, to work out 6 x 8
- Use 10 times tables, to work out 7 x 9
2. Solve x and ÷ problems ... by DOUBLING and HALVING
2. Solve x and ÷ problems ... by DOUBLING and HALVING
Book 6
Page 120 Numbers 11-14
Page 120 Numbers 11-14
Solve using doubling and halving
Eg: 5 x 18 = 10 x 9 = 90
50 x 28
23 x 4
3 x 14
20 x 32
16 x 50
36 x 5
34 x 50
4 x 18
Solve using doubling and halving
Eg: 16 ÷ 4 = 8 ÷ 2 = 4
20 ÷ 4
45 ÷ 5
24 ÷ 6
48 ÷ 8
52 ÷ 4
36 ÷ 12
60 ÷ 5
42 ÷ 2
Show how you could solve these problems by using doubling and halving
24 ÷ 4
65 ÷ 5
30 ÷ 6
48 ÷ 8
14 x 50
20 x 17
26 x 4
34 x 5
3. Solve x problems ... by CHANGING THE ORDER to make it easier
3. Solve x problems ... by CHANGING THE ORDER to make it easier
Book 6
Page 116 - 117
Page 116 - 117
Show how you could rearrange these factors to make it easier
5 x 7 x 6
14 x 7 x 10
6 x 8 x 4
14 x 50 x 10
5 x 8 x 4
12 x 7 x 10
4. Solve x problems ... by REVERSING between x and ÷ to make it easier
4. Solve x problems ... by REVERSING between x and ÷ to make it easier
Book 6
Book 6
Page 128 - 135
Page 128 - 135
Show how you could use multiplication facts to solve these division equations.
5. Solve x and ÷ problems by ROUNDING numbers & COMPENSATING after
5. Solve x and ÷ problems by ROUNDING numbers & COMPENSATING after
Book 6
Book 6
Page 112 - 115
Page 112 - 115
Use rounding and compensating for these equations - WATCH OUT! Check the sign. There's all 4 operations!
- 196 + 455
- 368 + 299
- 490 + 447
- 679 - 398
- 396 ÷ 4
- 378 ÷ 3
- 3 × 19
- 5 × 119
- 8 × 98
- 480 ÷ 9
TASK 1:
Show how you could use rounding and compensating to solve these equations
49 x 7
58 x 9
208 x 14
92 ÷ 4
104 ÷ 8
64 ÷ 4
TASK 2: Solve using rounding and compensating - Show your working.
- A factory sells chairs and tables. A table sells for $696 and a chair costs $108. How much does it cost for a table and 4 chairs?
- How much for a table and 6 chairs?
- A restaurant wants to buy 8 tables and 32 chairs. How much would this be?
6. Solve ÷ problems by sharing into equal sets
6. Solve ÷ problems by sharing into equal sets
TASK 1:
Show how you could use rounding and compensating to solve these equations
49 x 7
58 x 9
208 x 14
92 ÷ 4
104 ÷ 8
64 ÷ 4
7. Solve x problems with multiples of ten: tens, hundreds, thousands
7. Solve x problems with multiples of ten: tens, hundreds, thousands
Book 6
Page 108 - 111
Page 108 - 111
See how you go selecting an efficient strategy
See how you go selecting an efficient strategy
Number Sense Book 1 Yr 7/8 Link
"Choice Calculations" Page 1
"Choice Calculations" Page 1
"Splitting Numbers" Page 2
"Splitting Numbers" Page 2
"Hit the Target" Page 7
"Hit the Target" Page 7
"Pathways" Page 8
"Pathways" Page 8
Book 6
Page 138 - 141
Page 142 - 149
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