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To perform mental calculations

Mathematics

Multiplication

Educator section

Memorandum

1. Addition

Multiplier

Product

Multiplicant

Factors

Multiples

1 x 3 786; 2 x 1 893; 6 x 631; 631 x 6

BRAIN TEASERS

3 786 3 786 x 1; 1 893 x 2

3 x 1 262; 1 262 x 3

1 x 8 742; 8 742 x 1; 6 x 1 457; 1 457 x 6

8 742 2 x 4 371; 4 371 x 2

3 x 2 914; 2 914 x 3

Leaner section

Content

Activity:to perform mental calculations [lo 1.9.2]

1. How well do you know your 12 × table? Count in 12’s and colour each answer in green.

If you do this correctly you will find the answer to the following:

Multiplication is actually repeated _________________________________________

12	14	34	41	68	70	82	100	109	124	131	142	150	197
A	W	V	F	H	O	B	G	X	H	B	E	T	S
22	24	36	46	64	73	96	110	112	126	135	146	151	180
B	D	D	T	I	U	N	A	Z	R	D	O	R	E
30	26	32	48	62	71	84	115	119	120	137	144	154	168
M	Y	R	I	E	J	O	I	C	T	K	E	A	V
41	28	40	50	60	72	101	117	121	129	132	148	156	165
S	K	T	B	T	I	Y	D	H	S	W	F	L	F

Can you find any more multiples of 12? Colour them in blue.

What word does your answer spell? _______________________________________

2. LET US REVISE!

Fill in the missing answer:

In 24 x 17 = 408, we call:

17 the________________________________________________________________

408 the_______________________________________________________________

24 the________________________________________________________________

24 and 17 ______________________________________________________ of 408

408 a ___________________________________________________________ of 17

Assessment

Learning Outcome 1: The learner will be able to recognise, describe and represent numbers and their relationships, and to count, estimate, calculate and check with competence and confidence in solving problems.

Assessment Standard 1.9: We know this when the learner performs mental calculations involving:

1.9.2: multiplication of whole numbers to at least 12 x 12.

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Read also:

OpenStax, Mathematics grade 6. OpenStax CNX. Sep 10, 2009 Download for free at http://cnx.org/content/col11030/1.1

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12	14	34	41	68	70	82	100	109	124	131	142	150	197
A	W	V	F	H	O	B	G	X	H	B	E	T	S
22	24	36	46	64	73	96	110	112	126	135	146	151	180
B	D	D	T	I	U	N	A	Z	R	D	O	R	E
30	26	32	48	62	71	84	115	119	120	137	144	154	168
M	Y	R	I	E	J	O	I	C	T	K	E	A	V
41	28	40	50	60	72	101	117	121	129	132	148	156	165
S	K	T	B	T	I	Y	D	H	S	W	F	L	F

12	14	34	41	68	70	82	100	109	124	131	142	150	197
A	W	V	F	H	O	B	G	X	H	B	E	T	S
22	24	36	46	64	73	96	110	112	126	135	146	151	180
B	D	D	T	I	U	N	A	Z	R	D	O	R	E
30	26	32	48	62	71	84	115	119	120	137	144	154	168
M	Y	R	I	E	J	O	I	C	T	K	E	A	V
41	28	40	50	60	72	101	117	121	129	132	148	156	165
S	K	T	B	T	I	Y	D	H	S	W	F	L	F

12	14	34	41	68	70	82	100	109	124	131	142	150	197
A	W	V	F	H	O	B	G	X	H	B	E	T	S
22	24	36	46	64	73	96	110	112	126	135	146	151	180
B	D	D	T	I	U	N	A	Z	R	D	O	R	E
30	26	32	48	62	71	84	115	119	120	137	144	154	168
M	Y	R	I	E	J	O	I	C	T	K	E	A	V
41	28	40	50	60	72	101	117	121	129	132	148	156	165
S	K	T	B	T	I	Y	D	H	S	W	F	L	F