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ACTIVITY 1
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | |
x 6 | 36 | 42 | 48 | 54 | 72 |
2. Multiples of 7
2.1 Flow diagram – output numbers: 14; 21; 28; 35; 42; 49; 56; 63; 70
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | |
x 7 | 28 | 35 | 42 | 49 | 56 | 63 | 84 |
2.3 105; 98; 91; 84; 77; 70; 63; 56; 49; 42; 35; 28; 21; 14; 7; 0
2.4 Missing multiples of 6 and of 7
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | |
x 6 | 30 | 36 | 42 | 48 | 54 | 60 | 66 | 72 | ||||
x 7 | 35 | 42 | 49 | 56 | 63 | 70 | 77 | 84 |
2.5 The difference between the multiples of 6 and of 7: 1; 2; 3; …
i.e. 1 x 6 = 6 ; 1 x 7 = 7 the difference between the answers is 1;
2 x 6 = 12 ; 2 x 7 = 14 the difference between the answers is 2;
3 x 6 = 18 ; 3 x 7 = 21 the difference between the answers is 3, etc.
Missing numbers:
1; 5 ; 9
2; 6; 10
3; 7; 11
4; 8; 12
32, 40, 48, 56, 64, 72, 80, 88, 96, 104, 112, 120
3.2 Flow diagram: missing output numbers: 16; 24; 32; 40; 48; 56; 64; 72; 80
3.3 Missing multiples of 8:
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | |
x 8 | 24 | 32 | 40 | 48 | 56 | 64 | 72 | 96 |
3.4 Oral
3.5 Oral
4. Multiples of 9
4.1 Flow diagram – missing output numbers: 18; 27; 36; 45; 54; 63; 72; 81; 90
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | |
x 9 | 36 | 45 | 54 | 63 | 72 | 81 | 108 |
1. (a) 28, 48, 72, 16
(b) 72, 21, 7, 54
(c) 42, 56, 30, 56
(d) 10, 27, 63, 25
(e) 100, 16, 81, 24
(f) 18, 40, 0, 72
(g) 8, 40, 21, 70
(h) 30, 36, 64, 24
(j) 16, 0, 36, 35
(k) 45, 32, 35, 28
2. Own
ACTIVITY 2
1. Flow diagram – multiples of 8, mixed up
Missing output numbers: 16; 72; 32; 48; 64; 56; 40; 24; 80
2. Own
3. Own
4. Own methods of solving multiplication of single digit x single digit.
1. Flow diagram – missing output numbers: 50; 57; 64; 71; 78; 85
2. Flow diagram – missing output numbers: 6; 7; 8; …;11
– missing output numbers: …; 86; 95
3. Flow diagram – missing output numbers: …; 8
– missing output numbers: 28; 40; 46; …; 58; 76
4. Flow diagram – missing output numbers: …; 6; 7
5. Flow diagram – missing output numbers: …; 6; 7
missing output numbers: 240; 300; …; 480; 540
6. x 60 ≈ x 6 x 10
7. Missing answers
(a) 120 (b) 490 (c) 150 (d) 630 (e) 240
(f) 800 (g) 3 600 (h) 4 000 (j) 420 (k) 4 500
ACTIVITY 3 – estimations and calculations
1.1 126; 7 x 20 = 140 or 10 x 18 = 180
1.2 144 20 x 6 = 120 or 24 x 10 = 240 or 20 x 10 = 200
1.3 1 944 40 x 50 = 2 000
2. Word sums
2.1 6 Smarties
2.2 7 vehicles
2.3 17 trays and 4 apples left over
3.
3.1 2 000 kg: 2 000 + 500
3.2 20 bags: 25 x 20 = 500
3.3 715 km: rounding off: 60 x 10 = 600 (various methods of checking)
3.4 605 km; rounding off: 60 x 10 = 600
3.5 307 km 899 km + 307 km = 762 km + 444 km
3.6 17 rondavels; 17 x 8 = 80 + 56 = 136
3.7 R39: 39 x 7 = 210 + 63 = 273
3.8 I – I – I – I – I – I : 51 m
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